The 28-year-old right-hander pitched two innings and allowed two runs (both in the first inning) with three hits, two strikeouts and four walks.
The Missions beat the Nashville Sounds 5-3 to sweep the four-game series and win their eighth straight.
Miller pitched in the majors for the Arizona Diamondbacks, Atlanta Braves, St. Louis Cardinals and Texas Rangers. He was released by the Rangers earlier in July and signed a minor-league contract with the Milwaukee Brewers. He appeared in 18 games for the Rangers this season, starting eight and recording a 1-3 record with an 8.59 ERA.
Miller was an All-Star with the Braves in 2015. He had Tommy John surgery in 2017 and missed most of the 2018 season.
