SAN DIEGO — One contingent of fans at Petco Park, the faction wearing brown and yellow, cheered wildly once Manny Machado cracked the curveball in the fourth inning Tuesday night. The San Diego Padres, down a run, still were seeking their first hit off Julio Urías. Machado’s blast, everyone in the stadium assumed, would give them not only a hit but also a lead over the Dodgers.

AJ Pollock’s job was to not assume. The Dodgers left fielder saw a chance. He retreated to the ad-cluttered wall, leaped, stuck his black glove between three panicky fans’ outstretched hands, and caught the baseball. Once the masses saw that he came down with the robbery, the other group of spectators, the visitors in blue, erupted. Urías held up his arms, pointing to Pollock, in a gleeful shock. Center field Cody Bellinger jumped and ran over to congratulate his teammate.

“I thought it was a home run,” Urías said in Spanish.