LOS ANGELES—Matt Beaty hit a tiebreaking, two-run double with two outs in the fifth inning to lead the Los Angeles Dodgers past the Pittsburgh Pirates 4-3 on Aug. 17. The Dodgers extended their franchise-record winning streak to 15 games against the Pirates. Los Angeles has won five in a row and 10 of 12 overall, but still hasn’t gained any ground on NL West-leading San Francisco, which holds a four-game lead over the defending World Series champions. “We’ve got to continue to play good baseball. I still really don’t feel like we’ve played our best baseball,” Dodgers starter David Price said. “Can’t really worry about what the Giants are doing. We need to keep our foot on the gas.” The Pirates dropped their fourth in a row and have lost 14 of 16. The L.A. bullpen turned in another stellar effort, with Corey Knebel (2-0), Phil Bickford and Blake Treinen …