Koss went 2-for-4 with two home runs and three RBI in Saturday's 9-5 win over the Mets.
Both homers came off Zac Thornton, with Koss belting a two-run shot in the third inning and a solo blast in the fifth. The shortstop has flipped the switch at the plate in September -- he entered the month with a .498 OPS in 47 big-league contests, but over the last five games he's gone 6-for-19 (.316) with two homers, a walk, four RBI and eight runs.