PHOENIX—Tony Gonsolin’s second pitch of the game was smoked by Arizona’s Josh Rojas before Los Angeles left fielder A.J. Pollock robbed a potential extra-base hit, leaping at the warning track to snag the line drive. Gonsolin raised his arms in the air, then tipped his cap to Pollock. It wasn’t the last time the Dodgers pitchers would get some big-time help from their defense on Sept. 24. Pollock added a two-run homer, Chris Taylor robbed a pair of potential extra-base hits on defense in the ninth inning and the Dodgers kept pace in the NL West race by beating the Diamondbacks 4–2. The Dodgers (99–55) remained one game back of the San Francisco Giants (100–54) with eight games left for both teams. The Giants also won Friday, beating the Rockies 7–2. “I’m sure they’re looking at us saying ‘They just keep winning,'” Pollock said. “And we’re looking at them saying …