Gelof went 1-for-4 with a three-run home run during the Athletics' 5-3 loss to the Guardians on Friday.
Gelof put the A's up early, taking the second pitch he saw from Daniel Espino deep to center field for a three-run homer. It was Gelof's fifth home run over his last 15 games and 19th long ball of the season, as he needs only one more to register the first 20-homer season of his major-league career. Gelof has an .803 OPS with 11 RBI and four steals in September.