Hathaway began the 2016 season with the Double-A Mobile BayBears, and received a promotion to the Triple-A Reno Aces during the season. On July 30, 2016, Hathaway was selected to the 40-man roster and promoted to the major leagues for the first time.[4][5] Hathaway made 24 appearances for the Diamondbacks during his rookie campaign, recording a 4.91 ERA with 15 strikeouts across 14+2⁄3 innings pitched.[6]
Hathaway dealt with shoulder bursitis to begin the 2017 season, necessitating a disabled list placement to begin the year.[7] He made only one appearance for the Double-A Jackson Generals during the year, missing the majority of the year due to persisting shoulder issues. Hathaway was transferred to the 60-day injured list on May 6, 2017.[8] On October 16, Hathaway was removed from the 40-man roster and sent outright to Triple-A Reno.[9]
Hathaway did not make an appearance for the organization during the 2018 season. He was released by the Diamondbacks on March 14, 2019.
As of 2020[update], Hathaway had the most career Major League pitching appearances without a game started or a game finished.[10]
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