Gsellman’s changeup was a “Money Pitch”, although the pitch only managed an18.6% K% despite a 16.8% SwStr%. This is most likely due to sequencing.
Gsellman primarily used his curveball in situations with two strikes, where he was trying to get a batter to chase. The pitch managed an 11% SwStr% and he walked just two batters on the pitch despite throwing it for strikes just 50% of the time.
Gsellman increased the velocity on his sinker, with the max velocity touching 99. Unfortunately, the pitch ended up having its lowest GB% and K% of Gsellman’s career.
Gsellman made his money with his slider, sporting an 18.3% SwStr% and a 58 wRC+.
Gsellman’s biggest usage shift when he transitioned to the bullpen was virtually ditching the four-seamer in favor of the sinker. He threw it over 60% of the time, with mixed results. It was around the zone and gave up a fair amount of hits, but not major damage.
Gsellman’s slider was as good as his curveball, with strong strikeout metrics. Batters managed a paltry .133 average against it. The slider Gsellman’s primary breaking ball, just ahead of the curve.
Gsellman added both vertical and horizontal movement to his curveball, and it bounced back after a brutal 2017. The hook had a massive strikeout rate, supported by solid whiff and chase rates. It’s Gsellman’s go-to putaway pitch.
The changeup is Gsellman’s fourth pitch and it struggled in 2018. The pitch had solid whiff and chase numbers, but left the yard too often.
Gsellman hardly threw any four-seamers last season, relying primarily on his sinker. The velocity ticked up slightly with Gsellman working strictly out of the bullpen, but it was still his least-used pitch.