The Giants claimed outfielder Justin Dean and left-hander Reiver Sanmartin off waivers from the Dodgers and Reds, respectively, on Thursday. Right-hander Mason Black was designated for assignment to clear a spot on the 40-man roster.

Dean, 28, appeared in only 18 regular-season games for the World Series champion Dodgers this year, but he earned a spot on their postseason roster thanks to his plus defense and speed. He was involved in a pivotal play during Game 6 of the Fall Classic against the Blue Jays, as he threw his hands up and requested a dead-ball ruling when Addison Barger’s ninth-inning double ended up wedged at the bottom of the center-field wall at Rogers Centre.

Dean’s heads-up play ultimately prevented Toronto from scoring, allowing the Dodgers to force a Game 7 a

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