SAN FRANCISCO—Tim Lincecum pitched a two-hitter and struck out 14 in a dominating postseason debut, and the San Francisco Giants scored their only run after a questionable umpiring call to beat the wild-card Atlanta Braves 1-0 in Game 1 of their NL division series Thursday night.The Freak really showed up for San Francisco in his biggest start yet, pitching his own gem a day after Philadelphia’s Roy Halladay threw only the second no-hitter in postseason history in his debut. Lincecum outdueled playoff veteran Derek Lowe and caught a break, too.Cody Ross singled in a run in the fourth after Buster Posey was called safe on a steal of second by umpire Paul Emmel. Posey appeared to be tagged out by Brooks Conrad on the play.