In his major league debut on July 22, he allowed two earned runs in 5 innings to the Seattle Mariners and was charged with a loss. Gabbard's first major league win was on September 5 against the Chicago White Sox. Gabbard pitched seven shutout innings, surrendering three hits and striking out six in a 1-0 Red Sox win.
On July 22nd, Gabbard made his debut in Major League Baseball, giving up two earned runs in five innings to the Seattle Mariners and losing the game. However, he achieved his first win on September 5th against the Chicago White Sox, pitching seven scoreless innings, allowing three hits, and striking out six batters in a 1-0 Red Sox victory.