Aaron Bummer

LHP Aaron Bummer (MiLB.com profile picture)

Position: LH RP
Born: 9/21/1993
Ht: 6'3" Wt: 200
Acquired: Drafted 19th round in 2014 by White Sox out of Nebraska
Career Stats

FutureSox Prospect Rankings: 

  • #28- Preseason 2018

FutureSox Media:


  • n/a

Scouting Report:

Aaron Bummer was drafted in the 19th round of the 2014 draft by the White Sox out of Nebraska. He received a draft bonus of $100K (10th round equivalent) after displaying a fastball in the 88-92 mph range in Lincoln. Bummer did exhibit a mid 90's fastball in shorter stints the previous summer during the Cape Cod League and it was enough to entice the White Sox. Aaron pitched well out of the gate in the system with rookie level Great Falls in 2014, where he posted a 2.45 ERA in 22 innings while striking out almost 12 hitters per 9 innings. But he went in for minor elbow surgery after the season to clear out "loose bodies", causing him to miss the beginning of 2015. During rehab it was discovered he had a torn UCL, so he went in for a second surgery, this time TJS, causing him to miss the rest of 2015 and much of 2016. Bummer returned to the mound and threw just 16.2 innings in 2016 across multiple affiliates while displaying the stuff and high strikeout totals that he showed in rookie ball.

Bummer possesses a 70-grade fastball to go along with a developing slider that has shown plus character. He established himself as the best left-handed reliever in the White Sox system in 2016 and earned a spring training invite last year. His fastball was overpowering at times in the minors but he struggles to locate it. He throws his fastball in the 95-99 mph range while generating high strikeout totals. He threw 49 minor league innings last season and reached AAA Charlotte. Across three levels, he posted a 3.31 ERA with 54 strikeouts and 20 walks. Bummer was called up to the White Sox on July 27, 2017 and remained there for the rest of the season. In 22 innings for the White Sox, Bummer showed lofty promise while being erratic at times. He had 17 strikeouts to go along with 15 walks in the big leagues. He posted a 4.50 ERA while appearing in 30 games and holding opponents to a batting average of .178. If he can cut down on the walks he should be a fixture on the South Side going forward. He will be given every opportunity this spring to sew up a spot on the initial 25-man roster and will likely break camp with the White Sox.

Major League Outlook: Late Inning Reliever
ETA: 2018

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