After not being heavily recruited out of New Rochelle High School, Gray accepted his only scholarship offer to play college baseball for the Le Moyne Dolphins in Syracuse, New York.

[1] He spent his first two seasons at Le Moyne splitting time as a shortstop and a pitcher before transitioning to the mound full-time.

[4] On December 21, 2018, the Reds traded Gray, along with Jeter Downs and Homer Bailey, to the Los Angeles Dodgers in exchange for Matt Kemp, Yasiel Puig, Alex Wood, Kyle Farmer and cash considerations.

[13] He appeared in one other game for the Dodgers, making his first MLB start on July 25 against the Colorado Rockies, striking out six in four innings while allowing two runs on three hits and four walks.

[14] On July 30, 2021, Gray was traded to the Washington Nationals along with Keibert Ruiz, Donovan Casey, and Gerardo Carrillo in exchange for Max Scherzer and Trea Turner.

[19] At the All-Star game, Gray pitched the bottom of the third inning for the National League, allowing no runners on base.

[22] On July 19, it was announced that Gray would undergo season-ending surgery to repair a partial tear in his ulnar collateral ligament.