Serwa was a viral social media sensation when clips showed him throwing the fastest-ever recorded knuckleball, a pitch which averages 87 mph and maxes out at 88.5 mph. The 27-year-old can also touch the mid-90s with a fastball as part of a five-pitch mix. Serwa pitched for the independent league Chicago Dogs in the American Association in 2024, holding a 4.22 ERA and 103:23 K:BB over 119.1 innings. It's a longshot that he makes it to the majors after signing with the Tigers, but Serwa is a fun story worth tracking. Read Past Outlooks