The change is a total afterthought in Bummer’s repertoire; he threw it only five times last season. It was effective, but it’s nothing more than a change-of-pace pitch thrown once in a blue moon.
Bummer threw his sinker an overwhelming amount last year, but the cutter saw a bump in usage last season as well. With an O-Swing rate of 44% and a SwStr rate of 22%, it was a plus pitch, and a solid offering to complement the sinker.
With more use of the cutter, Bummer has cut down on the use of his slider. However, the pitch was filthy last season in that limited use. He hled opposing batters to a wOBA of .097.
Bummer’s primary pitch has been and should continue to be his sinking fastball. The results between 2017 and 2018 varied wildly for Bummer, but a career 68.5% ground-ball rate and .058 ISO are indicators of a promising pitch for the 25-year-old southpaw.
After centering around his slider in 2017, Bummer backed off the offering in lieu of more diverse offspeed offerings in 2018. The results saw an increase in contact rate (59.5%) and a spike in line-drive rate (42.9%) along with a drop off in swing rate (33.9%), zone rate (27.4%), and swinging-strike rate (13.7%).
Like seemingly every pitcher in the Chicago White Sox organization, Bummer has developed a cutter. The pitch bridges the gap between his fastball and slider but doesn’t offer much value on its own. Opponents went 4-for-11 against the pitch, neutralizing Bummer’s 70.0% ground-ball rate by finding the gaps and generating a .400 BABIP alongside a .182 ISO.
While he only threw it around 3% of the time, Bummer was able to generate four strikeouts against six batters with his changeup in 2018. Through 28 total pitches, Bummer has only found the zone with his changeup 39.3% of the time and generated a swing on 25.0% of offerings. With uninspiring velocity, movement, and command, Bummer’s changeup lacks standalone substance going forward.