Buster Posey hit a two-run home run and Tim Lincecum earned his first victory of the season for the San Francisco Giants, who had only three hits in beating San Diego 4-3 Sunday to snap a three-game losing streak.CORRECTS NAME OF PITCHER TO LINCECUM - San Francisco Giants starting pitcher Tim Lincecum works against the San Diego Padres in the first inning of a baseball game Sunday, April 20, 2014, in San Diego.San Diego Padres second baseman Alexi Amarista, right, and shortstop Everth Cabrera, top, cannot reach a single by San Francisco Giants' Brandon Crawford as Giants baserunner Brandon Hicks (14) races around the bases to third in the second inning of a baseball game on Sunday, April 20, 2014, in San Diego.CORRECTS NAME OF PITCHER TO LINECUM - San Francisco Giants starting pitcher Tim Linecum works against the San Diego Padres in the first inning of a baseball game Sunday, April 20, 2014, in San Diego.San Diego Padres starting pitcher Robbie Erlin works against the San Francisco Giants in the first inning of a baseball game on Sunday, April 20, 2014, in San Diego.