Reimer began the 2015–16 season as Bernier's backup, a role he had held since the team acquired the latter. However, Bernier was injured early in the season and Reimer was given starting duties. He took off with the job, going 3–0–0 with a 1.62 GAA and .952 save percentage to be named the third star for the week of November 9–15, 2015. Reimer would hold the position as Maple Leafs' starting goaltender for the rest of his tenure, earning praise for his play on a Toronto team that struggled throughout the year.