Inge added a two-run triple in the eighth for the Tigers, who avoided a three-game interleague sweep at the hands of the Giants and moved within 1/2 game of Cleveland atop the American League Central.
Rick Porcello (7-6) broke a personal four-game winless streak, yielding three runs on five hits over seven frames, walking two and fanning six, and Jose Valverde tossed a scoreless ninth to lock up his 20th save for the Tigers.
Cody Ross delivered an RBI single among his two hits for San Francisco.
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