The young Diamondbacks, who earned the final National League wild card despite losing their last four regular-season games, improved to 4-0 in these playoffs - all on the road against division winners.
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They'll try for a stunning sweep of the 100-win Dodgers when the best-of-five series shifts to Arizona for Game 3 on Wednesday.
Gallen allowed two runs over 5 1/3 innings for his second win of the postseason. Gurriel laced an RBI single to cap a three-run first, and the Diamondbacks chased rookie starter Bobby Miller in the second - two days after Los Angeles ace Clayton Kershaw was tagged for six runs while getting only one out during Arizona's 11-2 rout in Game 1.
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Gurriel added a solo homer in the sixth to make it 4-1.