Aaron Ashby, an American professional baseball pitcher for the Milwaukee Brewers of Major League Baseball, was born on May 24, 1998.
The Brewers selected him in the fourth round of the 2018 Major League Baseball draft. The Milwaukee Brewers selected Ashby in the fourth round, 125th overall, of the 2018 Major League Baseball draft out of Crowder College.
He made his professional debut with the Rookie-level Helena Brewers, as well as the Single-A Wisconsin Timber Rattlers, where he went 2–3 with a 3.59 ERA in 13 games.
In 2019, Ashby pitched for the Wisconsin Badgers and the High-A Carolina Mudcats, posting a 5–10 record and 3.50 ERA in 24 outings.
Ashby did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic. He was assigned to the Triple-A Nashville Sounds to begin the 2021 season. Ashby was shifted to the bullpen in June and recorded a 4–1 record and 4.50 ERA in 12 games for the team.
On June 29, 2021, the Brewers announced that they would promote Ashby to the major leagues for the first time. He was formally selected to the 40-man and active rosters the on June 30. He made his MLB debut that day as the starting pitcher against the Chicago Cubs.
In his debut, he went 2⁄3 of an inning and allowed 7 runs, 4 earned. At the end of his 1st season, he played in 13 games, 4 in which he started, and he put up a record of 3-2, with an ERA of 4.55 and 39 strikeouts in 31.2 innings.