[2] After his junior year, the Philadelphia Phillies selected Milner in the seventh round of the 2012 MLB draft.

[3] He made his professional debut in 2012 with the Low-A Williamsport Crosscutters, and also played for the Single-A Lakewood BlueClaws, accumulating a 7-3 record and 2.50 ERA between the two teams.

He spent the 2014 season in Double-A with the Reading Fightin Phils, pitching to a 10-6 record and 4.21 ERA with 86 strikeouts.

[7] He made his MLB debut on June 24, pitching 1.0 inning and allowing 1 run against the Arizona Diamondbacks.

[8] On July 14, 2018, the Philadelphia Phillies traded Milner to the Tampa Bay Rays for cash considerations.

[14] His first pitch as an Angel allowed a walkoff grand slam to Matt Olson of the Oakland Athletics on Opening Day 2020.

[18] Milner made 19 total appearances for Milwaukee in 2021, logging a 5.40 ERA with 30 strikeouts in 21+2⁄3 innings pitched.

[19] Milner pitched in a career-high 67 contests for the Brewers in 2022, logging a 3-3 record and 3.76 ERA with 64 strikeouts in 64.2 innings of work.

On January 12, 2023, Milner agreed to a one-year, $1.025 million contract with the Brewers, avoiding salary arbitration.