He has appeared in 8 of the Mets first 13 games with 9 innings pitched, not counting the appearance where he didn't record an out. He's on a pace for 100 appearances and 112 innings out of the bullpen. No reliever has appeared in 100 games since Mike Marshall won the Cy Young award in 1974. In fact, only three players in baseball history have pitched in more than 70 games in a season before turning 24. The immortal Byung-Hyung Kim did it twice, in '01 and '02, Mitch "Wild Thing" Williams in '86 and '87 and Oscar Villareal for the D-Backs in '03. Villareal went on to pitch a total of 31.2 innings in the next two seasons combined. He was back to 90+ innings the following year. He has not pitched in the majors since 2008, done at 26 years old. Williams had a nice career, with as many as 43 saves in a season, and 192 in his career. While he pitched only 68 innings as a 23-year old, he never missed significant time until he was 28. His career was over at 32. And of course Kim, who they tried to turn into a starter at age 24. His career too was over at age 28.