Waites was recalled from Triple-A Sacramento on Tuesday, Alex Pavlovic of NBC Sports Bay Area reports.
Waites was called up for his first taste of the majors Sept. 12 and appeared in five games before he was sent back to Sacramento 10 days later. The 24-year-old allowed one earned run with a 3:4 K:BB across five innings during that stretch, and he's now back with the big-league club for the final two games of the season.