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Tyler Duffey was drafted in the 5th round of the 2012 draft out of Rice. Despite spending much of his college career in the bullpen, the Twins were able to boost his fastball velocity and add a changeup to his already plus breaking ball, and make him a starter. After debuting in the Twins rotation, Duffey struggled and became an afterthought before eventually resurfacing in the bullpen.
The right-hander of course used a change in fastball philosophy and his wipeout curveball to become one of the most underrated relievers in all of baseball during 2019-2020. 2021 was a bit shaky but Duffey has established himself as a reliable, high leverage reliever. The Twins should use Duffey’s successful blueprint on another arm who shares several similarities.
Griffin Jax has been a starter throughout the minors and filled in for an ailing rotation during his 2021 debut. The Air Force Captain was never a top prospect and rarely posted above-average performances in the minors. Upon his debut, it was clear that Jax was a two-pitch pitcher, a trait that led to significant trouble navigating lineups multiple times. What wasn’t apparent until his debut is just how good one of his two pitches was.
Eno Sarris, a prominent writer at The Athletic uses a pitching model called Pitching+ which measures velocity, movement, and spin to determine a pitcher’s “Stuff+” while measuring their ability to locate into “Location+”. A 100 grading is average for both metrics. Jax, due in large part to his slider, grades ahead of Bailey Ober, Joe Ryan, and Dylan Bundy in Stuff+ at an above average 102.8. While the full pitch by pitch Pitching+ Model isn’t publicly available, Sarris has noted that Jax’s slider is one of the best pitches in baseball according to Stuff+.
It’s fair to assume Jax’s fastball may hold him back with little movement and averaging under 93 mph. What he’s left with is a less than spectacular fastball to set up for a fantastic breaking ball. This approach likely doesn’t pan out well in the rotation, but could be more than enough to dominate in short stints as we’ve seen with Tyler Duffey. As fellow Twins Daily writer Cody Christie pointed out in January, Jax would slot into an opener role very well based on his success particularly in the first inning.
It’s also fair to wonder however whether Jax could thrive in a short-term, high leverage role in the late innings. Similar to Duffey, Jax could add some velocity to his fastball and try to place it at the top of the zone to set up his devastating breaker. It’s become a common recipe for success for relievers across baseball.
The Twins bullpen has a lot of uncertainty between Taylor Rogers’ finger, Tyler Duffey’s 2021 struggles, and the question of whether both pitchers will even be on the Twins Opening Day roster. With the front office unlikely to add significant free agents to the bullpen mix, someone like Jax who’s already shown his abilities at the MLB level could easily climb the bullpen ladder throughout 2022 and find himself settled into a significant role by season’s end.
Whether it’s opening games or closing them, Jax’s slider proving to be a cheat code of a pitch is a great development. With several high profile arms coming up with stronger chances of sticking in the rotation, the Twins developing deeper prospects such as Griffin Jax into possible bullpen pieces would be a huge development. Griffin Jax is an incredible story, but he’s elevated himself from a depth piece to a possible regular for the Twins in 2022. Do you agree?
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