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Jack Flaherty

Jack Flaherty

30-Year-Old PitcherSP
Detroit Tigers
2025 Stats
W-L
8-15
ERA
4.64
WHIP
1.28
K
188
SV
0
Rest-of-Season Projections
W-L
ERA
WHIP
K
SV
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2025 Fantasy Outlook
Flaherty had an interesting 2024 season after languishing in prior seasons attempting to recover what he last was in 2019 with the Cardinals. He may never get back to that level of success, but he came closer in 2024 than in any other season since his peak, even with the midseason change of employment. Flaherty came into the season working on his pitch shape and repertoire, and it showed in his success. The actual outcomes of his four-seamers in 2024 (.245 BA) matched the expected outcomes the pitch failed to realize in 2023 (.247 xBA), but the slider is where the success story truly lies. Flaherty had both a cutter and slider in 2023, and neither was an effective pitch by actual nor expected results. Flaherty scrapped the cutter and worked on the slider, and the work paid off. The league average against the pitch dropped from .339 to .222, while the pitch's whiff rate jumped from 26.5 to 36.3 percent. The postseason version of Flaherty reminds us of his inconsistent track record, and the last time he worked this much in a season, the subsequent season was disastrous. The 2024 season was a much-needed career recovery for Flaherty, but the path forward is anything but certain given his track record. Read Past Outlooks
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RANKS
Rest of Season
#Subscriber-Only
Overall Rank
#Subscriber-Only
Dynasty
From Preseason
#149
ADP
League Majors
Bats R
Throws R
40 Man Yes
Height 6'4"
Weight 225
DOB 10/15/1995
Born Burbank, CA
College None
Drafted 1st Rd 2014 STL
Signed a one-year, $25 million contract with the Tigers in February of 2025. Contract includes $10 million player option for 2026. Contract includes $10 million escalator for 2026 salary with 15 games started in 2025.
Takes loss in Game 3
PDetroit Tigers
October 7, 2025
Flaherty took the loss in Game 3 of the ALDS against Seattle on Tuesday after giving up four runs (three earned) on four hits and three walks while striking out six batters across 3.1 innings.
Analysis
The 29-year-old righty allowed just one man to reach base through two innings following a three-hour rain delay, but things took a turn at the start of the third frame after consecutive hits from Victor Robles, J.P. Crawford and Randy Arozarena allowed the Mariners to take a 2-0 lead. Flaherty came back out for the fourth frame but was quickly pulled after allowing a leadoff homer to Eugenio Suarez and walking Victor Robles, who eventually came around to score. The Tigers now find themselves on the brink of elimination, and Flaherty likely won't be available to pitch in relief for the rest of the series after needing 76 pitches to collect 10 outs Tuesday.
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Pitching Stats
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2025 MLB Game Log
2025
2024
2023
2022
2021
2020
2019
2018
2017
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Pitching Appearances Breakdown
Average Pitch Count
89
Last 10 Games
83
Last 5 Games
74
How many pitches does Jack Flaherty generally throw?
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
What part of the game does Jack Flaherty generally pitch?
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2023
 
 
-3%
BAA vs RHP
2025
 
 
-7%
BAA vs RHP
2024
 
 
-8%
BAA vs LHP
2023
 
 
-8%
BAA vs RHP
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .252 1056 254 99 237 39 6 34
Since 2023vs Right .245 924 276 64 207 47 2 30
2025vs Left .248 360 90 41 78 15 1 13
2025vs Right .231 321 98 18 69 16 0 10
2024vs Left .215 352 100 19 71 7 3 10
2024vs Right .233 297 94 19 64 11 2 14
2023vs Left .298 344 64 39 88 17 2 11
2023vs Right .274 306 84 27 74 20 0 6
More Splits→ View More Split Stats
Home/Away Pitching Splits
Since 2023
 
 
-4%
ERA on Road
2025
 
 
-21%
ERA at Home
2024
 
 
-15%
ERA on Road
2023
 
 
-20%
ERA on Road
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2023Home 4.32 1.26 223.0 14 17 0 10.3 3.2 1.3
Since 2023Away 4.16 1.33 244.1 15 14 0 10.2 3.1 1.1
2025Home 4.18 1.22 92.2 5 8 0 10.6 3.4 1.5
2025Away 5.27 1.36 68.1 3 7 0 10.4 3.2 1.1
2024Home 3.44 1.12 73.1 5 4 0 10.6 2.0 1.5
2024Away 2.94 1.03 88.2 8 3 0 11.0 2.2 1.2
2023Home 5.68 1.53 57.0 4 5 0 9.3 4.6 0.9
2023Away 4.53 1.61 87.1 4 4 0 9.2 3.8 1.1
More Splits→ View More Split Stats
Stat Review
How does Jack Flaherty compare to other starting pitchers?
This section compares his stats with all starting pitcher seasons from the previous three seasons (minimum 120 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.

* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 120 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
3.19
 
K/9
10.5
 
BB/9
3.3
 
HR/9
1.3
 
Fastball
93.9 mph
 
ERA
4.64
 
WHIP
1.28
 
BABIP
.318
 
GB/FB
1.01
 
Left On Base
69.6%
 
Exit Velocity
81.8 mph
 
Barrels/BBE
5.8%
 
Spin Rate
2318 rpm
 
Balls Hit 95+ MPH
24.9%
 
Swinging Strike
11.7%
 
Prospect Rankings History
View Complete Jack Flaherty Prospect Ranking History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Past Fantasy Outlooks
2024
2023
2022
2021
2020
2019
2018
2017
2016
2015
The good news for Flaherty is that he was healthy enough to make 29 appearances (27 starts) and throw 144.1 innings in 2023. That's no small feat for a guy who totaled 26 appearances (23 starts) and 114.1 frames over the previous two seasons combined. The bad news is he never resembled the guy who once looked like a budding ace. To give you an idea of how much Flaherty's stuff has backed up, note that he gave up 27 more hits in 2023 than he did during his stellar 2019 season, and he did so in 52 fewer innings. Flaherty's control has also become a problem, with his 10.2 percent walk rate representing the ninth-highest mark among 76 pitchers with at least 140 innings. The Orioles were intrigued enough by the righty to trade for him at the deadline, but he held a 6.75 ERA for them and was demoted to the bullpen. Detroit gave Flaherty a one-year, $14 million contract over the winter, and the righty will get to pitch in a favorable home park and work with up-and-coming pitching coach Chris Fetter. Flaherty is still young enough (28) to rediscover something, but he'll need to prove it before fantasy managers can trust him again.
After finishing the 2021 season seemingly healthy, Flaherty experienced shoulder soreness in spring training. He received a PRP injection to help combat the inflammation and Flaherty was shut down for a bit before ramping up with bullpen sessions. Flaherty made his debut on June 15 but mustered only three short appearances before a recurrence of the shoulder strain, sending him to the 60-day IL. Flaherty returned in September for five starts, posting a 4.00 ERA and 1.48 WHIP in 27 innings with 26 punch outs. However, control was an issue with 13 walks. Making it back and throwing all his pitches with normal velocity is encouraging, but including rehab, Flaherty has only logged 190.2 innings over the past three years. Even if healthy and effective, Flaherty's workload will likely be monitored. The smart approach is drafting Flaherty as a luxury, but chances are someone will pay for the potential.
Flaherty was supposed to be the anchor to the Cardinals' rotation, yet two separate injuries limited his season to fewer than 80 innings. He began the season extremely well, going 8-1 in his first 11 starts with a 2.90 ERA and 1.03 WHIP while striking out 26% of the batters he faced. He hit the IL for the first time at the end of May after straining his oblique while (unnecessarily) batting, and did not return to the mound until mid-August when he made three more starts before leaving in the last of those three starts with a right shoulder strain. Flaherty came back late in the season to work in relief, but there is no way to sugarcoat how disappointing the season was after such a terrific start. That disappointment carries over into 2022, as a small tear in Flaherty's right shoulder will sideline him for the start of the season. He received a PRP injection and is shut down from throwing for two weeks, but it's unclear exactly how much time he'll actually miss. Flaherty was expected to be a high-risk/high-reward pitching option for fantasy managers, and that risk is now even higher as his injury issues continue in 2022.
The small samples that come with a 60-game season were always going to lead to some disappointing years from top players. Flaherty was most certainly among that group. The large number of doubleheaders the Cardinals were forced to play due to their COVID-related shutdown meant the young right-hander was able to make just nine starts, and he struggled to a disappointing 4.91 ERA in those outings. There are plenty of reasons not to be too worried about his future. His strikeout rate dropped slightly from 29.9% to 28.8%, his walk rate rose from 7.1% to 9.4% and his groundball rate increased from 39.5% to 42.6% -- these are all marginal differences, suggesting he was essentially the same pitcher in terms of skills. One awful start can completely tank a player's ERA in such a short season, and Flaherty's would sit at a much-better 3.13 if not for a nine-run blowup against the Brewers in mid-September.
While 2018 was the breakout for Flaherty's delicious slider, 2019 was the breakout season for Flaherty as a pitcher. That seems silly to say when we look back at the midpoint of the season and find Flaherty 4-5 with a 4.90 ERA in his first 17 starts, but it was. At that time, Flaherty was getting the strikeouts, but 1.9 homers per nine innings limited his success. Flaherty changed his tune over his final 16 starts, going 7-3 with a 0.93 ERA and allowing six homers over his final 106.1 innings of work. He was simply masterful down the stretch for the Cardinals, holding opponents to a .139 batting average over those 16 starts. The real Flaherty lies somewhere in between those two groupings of stats. It is worth noting he has thrown over 400 innings the past two seasons, including 213.1 IP in 2019 when you include postseason work. That, plus the slider usage, is something to consider before going all-in.
The year didn't end on a positive note, with Flaherty posting a 5.34 ERA in September, but the overall body of work was stellar, especially for a 22-year-old taking his first real spin through the major leagues. Flaherty's fastball/slider combo is already one of the best in the game, and he can also change speeds although the changeup was a clear fourth offering behind the heater, slider and curve. He used that arsenal to strike batters out at a 29.6% clip, which was a top-10 mark among all pitchers with at least 150 innings. He shot himself in the foot occasionally with walks (3.5 BB/9) and homers (1.19 HR/9), but even marginal improvement to his 57.2% first-pitch strike rate should help on both fronts, and he's proven durable so far in his young professional career. With a rotation spot secured on what looks like a contending club, Flaherty should be viewed as a solid SP2 in mixed leagues.
Once seen as a likely No. 4 or No. 5 starter, the projectable 6-foot-4 righty finally delivered on the promise evaluators had long envisioned, with his fastball velocity jumping from the low-90s to the mid-90s in 2017. Exceptional command allowed him to profile as a back-end starter when he had middling stuff, and now that command allows him to project as a No. 3 starter. In addition to an improved fastball, Flaherty's slider also took a step forward, now profiling as his second-best offering. His curveball is more of a show-me pitch and his changeup is still developing, but has a chance to be a quality third pitch. Flaherty will not strike out a batter per inning, but should eventually be an asset in ERA and WHIP, and is ready to approach 200 innings. He got a brief taste of the majors last season, and will compete for a rotation spot this spring. One way or another, he figures to spend the bulk of 2018 in the big-league rotation, and makes for a decent flier at the end of deep-league drafts.
The 21-year-old Flaherty may not have the upside of some of the other pitchers in the St. Louis organization, but he achieved a good deal of success at High-A in 2016. The former first-round pick posted a 126:45 K:BB in 134 innings at that level. His fastball sits in the low-90s and is certainly not overpowering, but it does have a lot of movement. His changeup is above average, and Flaherty also features an emerging curveball and slider. In addition, Flaherty possesses an ideal frame at 6-foot-4, 205 pounds that should hold up to the rigors of being a rotation workhorse. Flaherty has the upside of a No. 2 starter and will begin the 2017 campaign at Double-A working to improve his secondary offerings.
Despite missing almost two months with a back injury at the start of the season, Flaherty managed to pass his first test pitching in a full-season league with flying colors. The 6-foot-4 righty posted a 2.84 ERA (2.83 FIP) with a 1.29 WHIP and 97 strikeouts in 95 innings with Low-A Peoria. He probably should have been challenged with a late-season promotion to the Florida State League, as his four-pitch mix was more than enough to dominate Low-A hitters. Flaherty will get his chance with High-A Palm Beach to start his age-20 season, but this may not be a one level per year arm, as the Cardinals might want to see how he fares in the upper levels at some point in 2016. A first-round pick in 2014, Flaherty has three pitches that could reach plus status, giving him a No. 2 ceiling, with the realistic floor of a No. 4 starter.
The Cardinals took Flaherty in the first round of the 2014 draft, inking the 6-foot-4 righty with a bonus well over the slot value for the No. 34 pick. He's several years away from contributing at the big league level but the Cardinals spent a lot to keep him from going to North Carolina for college. He was able to get in six starts in the Gulf Coast League for the Cardinals, posting an impressive 1.59 ERA and 28 strikeouts in just 22.2 innings as an 18-year-old. He could take some big steps forward in 2015, his first full year where his focus will be entirely on pitching, and if he can finish the season in High-A for the Cardinals it will be a great sign of things to come.
More Fantasy News
Lined up to start Game 3
PDetroit Tigers
October 5, 2025
Flaherty is expected to draw the start on the mound in Game 3 of the ALDS against the Mariners on Tuesday, Chris McCosky of The Detroit News reports.
Analysis
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Four strikeouts in Game 3
PDetroit Tigers
October 2, 2025
Flaherty didn't factor into the decision in Thursday's 6-3 win over Cleveland, allowing one earned run on three hits and two walks while striking out four batters across 4.2 innings.
Analysis
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Can't stem historic collapse
PDetroit Tigers
September 25, 2025
Flaherty (8-15) took the loss Wednesday, giving up three runs on five hits over 4.1 innings as the Tigers were downed 5-1 by the Guardians. He struck out six without walking a batter.
Analysis
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Stuck with 14th loss
PDetroit Tigers
September 18, 2025
Flaherty (8-14) allowed one run on three hits across five innings to take the loss Wednesday against the Guardians. He walked four and struck out four.
Analysis
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Looks sharp in eighth win
PDetroit Tigers
September 11, 2025
Flaherty (8-13) tossed five scoreless innings to earn the win in Wednesday's 11-1 victory over the Yankees. He allowed two hits and a walk, while striking out seven.
Analysis
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Latest Fantasy Rumors
Undecided on future
PDetroit Tigers
October 11, 2025
Flaherty is undecided on whether to return to Detroit for the 2026 season, according to Evan Woodbery of MLive.com, who said that "it would be a surprise" to see Flaherty pick up his player option for the upcoming campaign.
Analysis
Flaherty signed a two-year, $35 million contract with the Tigers before the start of the 2025 season, but he increased that guarantee by reaching the 15-start threshold and escalating his 2026 player option from $10 million to $20 million. If Flaherty feels he can get more than $20 million in the open market, he could reject the option and enter free agency for a third consecutive offseason. Flaherty had a 4.64 ERA across 161 innings in the 2025 regular season for Detroit.
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