In AA, Leathersich has posted a 1.53 ERA with a 1.193 WHIP, while striking out 55, in only 29 1/3 innings.
Leathersich relies mostly his fastball/curveball combination to get hitters out. His fastball has recently been 93-94 mph and touching 95. That's a tick better than he showed in the SAL last year when he was mostly 91-93. There's deception in the way he short-arms the ball and it hops on hitters. He knows how to elevate the offering to get chases. The key to Leathersich's improvement in AA has been his declining walk rate. In 13 innings in April, he walked 10 batters, a rate of 16.7%. In May and June, he walked six total batters in 16.1 innings, a rate of 9.4%. I had Leathersich ranked #31 on the pre-season Mets top prospect list as a potential middle-reliever. Note too that Leathersich is not strictly a left-handed specialist as he's actually been more effective against righties than against lefties in the last two years. This year, lefties have hit .367/.441/.533 against him in 34 PA while righties have hit .107/.236/.107 with zero extra-base hits in 90 PA. This continues a trend from last year in a-ball when lefties compiled a .707 OPS against Leathersich compared to .513 for righties.