SAN FRANCISCO (AP) — Thairo Estrada and Mike Yastrzemski hit back-to-back home runs in the third inning, and rookie right-hander Keaton Winn delivered another strong start to lead the San Francisco Giants to a 3-2 victory and a series win over the Pittsburgh Pirates. Rookie shortstop Tyler Fitzgerald added three hits for the Giants, who took two of three from the Pirates and finished their longest homestand of the season 6-4. Pittsburgh lost for the 10th time in its past 13 games. Winn (3-3) held the Pirates to one run over six innings, his line over the past three starts, all victories.