Gardner was named AL Player of the Week for the week ending June 28, 2015. He was one of the five candidates chosen for the All-Star Final Vote for the 2015 MLB All-Star Game, but was later removed from the ballot after being chosen to replace the injured Alex Gordon on the All-Star team. Gardner's hot first half would not last the whole season; after batting .302 up to the All-Star break, he struggled for the rest of the year, hitting .206 in the second half of the season. After going 0–4 with 3 strikeouts in the Yankees' 3–0 loss to the Houston Astros in the 2015 AL Wild Card Game, Gardner received a loud roar of boos from fans at Yankee Stadium.