Bumgarner made his postseason debut in Game 4 of the 2010 National League Division Series (NLDS) against the Atlanta Braves, and by pitching six innings advanced the Giants to the 2010 National League Championship Series (NLCS), becoming the youngest pitcher in Giants' franchise history to appear in, start, and win a playoff game. He was also the sixth-youngest pitcher to appear in a playoff game. In Game 6 of the NLCS, Bumgarner pitched two shutout relief innings against the Philadelphia Phillies as the Giants advanced to the 2010 World Series. In Game 4 of the World Series against the Texas Rangers, Bumgarner pitched eight shutout innings, allowing only three hits and permitting just one Ranger to reach second base, in the process of recording his first career World Series win. He became the fifth-youngest pitcher to start a World Series game. Bumgarner and Buster Posey were the first rookie battery to start a World Series game since Spec Shea and Yogi Berra in . This win gave the Giants a 3–1 lead in the series, en route to the Giants winning their first World Series championship since the 1954 World Series—and their first title in the 52-year history of the San Francisco era.