Gelof went 1-for-3 with a two-run home run and a walk in Tuesday's 9-7 win over the Angels.
Gelof gave the Athletics their margin of victory with his eighth-inning blast. The infielder has gone 7-for-20 (.350) with two homers and six RBI over his last five games. For the season, he's reached the 20-homer mark for the first time while batting .253 with a .781 OPS, 52 RBI, 71 runs scored, 15 doubles, two triples and 14 stolen bases over 106 games.