McClung (3-7) won for the third time in five starts since July 22.
The Indians lost for the third time in 12 games and fell 4 games back in the AL wild-card race.
Cantu hit a two-run homer in the third as Tampa Bay took a 4-0 lead against Scott Elarton (7-6). Cantu hit a solo shot, his 18th of the season, off Jeremy Guthrie in the seventh.
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