He played in Major League Baseball (MLB) for the Milwaukee Brewers and Arizona Diamondbacks.

[1] Overall, he appeared in 57 games in his three seasons in Utah, going 6–10 with a 2.73 earned run average (ERA) and 90 strikeouts in 99 innings.

[8] Wagner made 3 starts for the Brewers in 2015, posting an 0–2 record, 7.24 ERA, and 5 strikeouts in 132⁄3 total innings.

[9] On January 30, 2016, Wagner was traded to the Arizona Diamondbacks along with Jean Segura for Aaron Hill, Chase Anderson, Isan Diaz and cash considerations.

In 2018, Wagner played in 25 games (including 18 starts) for the Double–A Frisco RoughRiders and Triple–A Round Rock, accumulating a 4.76 ERA with 59 strikeouts across 104 innings pitched.