Matt Duffy homered and drove in three runs to help the San Francisco Giants snap a nine-game home losing streak by beating the Seattle Mariners 6-2 on Tuesday. Casey McGehee added a two-run double and Angel Pagan hit an RBI single as the Giants snapped their longest home skid since an 11-gamer at New York's Polo Grounds in 1940. Tim Lincecum (7-3) allowed two runs and five hits in 5 2/3 innings to get the win in his second start against his hometown team.