On Thursday the Chicago White Sox promoted left-handed pitcher Aaron Bummer to the major league roster. He threw an inning of relief in yesterday’s game against the Chicago Cubs, giving up a home run to Kyle Schwarber but fanning Anthony Rizzo. Here’s his background and a look at what we can expect in the future.

Bummer was drafted by the White Sox in the 19th round in 2014 from the University of Nebraska. Although mainly a starter with the Cornhuskers, he was seen as a future reliever by scouts and was immediately moved into the bullpen role when he joined the Sox system.

He missed 2015 with Tommy John surgery and spent most of 2016 on rehab. 2017 has been better: a combined 3.31 ERA in 49 innings between High-A, Double-A, and Triple-A with a 54/20 K/BB and 40 hits allowed.

Bummer is a 6-3, 200 pounder born September 21, 1993. He features a sinking fastball at 91-95 MPH and both a change-up and slider in the low-to-mid-80s. There’s some whippy arm action and he held lefties to a .188 average in his 33 innings of Double-A work.

His biggest problem is inconsistent command, but if Bummer throws enough strikes he can be a useful short reliever or LOOGY.