SAN FRANCISCO (AP) — San Francisco Giants manager Bruce Bochy has seen his team surge to baseball's best record, endure a summer-long skid and rally back into playoff contention, so he refuses to count his club out now. [...] three games behind the Los Angeles Dodgers with 13 to play, the Giants will have to pull off another surprising run to win the NL West this season. Clayton Kershaw outpitched Yusmeiro Petit for his major league-leading 19th win, and the Dodgers extended their lead in the division with a 4-2 victory over the Giants on Sunday. Buster Posey and pinch-hitter Matt Duffy had RBI singles for San Francisco. Kershaw was thrown out at second by right fielder Hunter Pence trying to stretch a single into a double in the seventh. Dodgers manager Don Mattingly visited the mound after Kershaw retired Panik on one pitch in the eighth. Dodgers: RHP Carlos Frias (0-0, 3.91 ERA) will likely make his second career start Wednesday at Colorado in place of Hyun-Jin Ryu, who is scheduled to have an MRI on his troublesome left shoulder Monday.