Though his strikeout numbers were still elite and he flashed unhittable stuff at times, Mets reliever Edwin Diaz had a nightmarish first season in Queens as his location betrayed him far too often as he gave up 15 home runs and posted a 5.59 ERA.
Part of what ailed Diaz in 2019 was his inability to harness his slider, but his fastball also found way too much plate. And new Mets pitching coach Jeremy Hefner is working on fixing both of those issues after diagnosing the problems.
"Edwin got in trouble with a little bit of arm-side run to his fastball and it ended up finding a few more barrels than he was used to in his career," Hefner said Wednesday night during an appearance on Baseball Night in New York: Living Room Edition. "And so that's all we've been trying to do is straighten out his fastball so he can get it to his glove side more consistently. There's a grip adjustment in there, there's an intent adjustment in there, and there's also some physical, mechanical adjustments in there as well."