PITTSBURGH (AP) _ San Francisco was fuming over its latest loss to the Pittsburgh Pirates.



Adam LaRoche hit a go-ahead single in a three-run seventh inning, and the Pirates rallied for a 5-4 victory Thursday and a three-game sweep.



The rally started when pinch-hitter Nyjer Morgan bunted down the third-base line and was ruled safe at first by umpire Ron Kulpa for a single. Replays appeared to show Morgan did not beat the throw.



"I had a great view of it and there was no doubt in my mind that he was out," Giants manager Bruce Bochy said. "It's a huge call. Instead of getting the first out there, now they have a rally going."



The Pirates trailed 4-2 against Matt Cain (1-3) when Morgan — who was optioned to Triple-A after the game — reached against Matt Cain (1-3).



"When we watched the replay, it looked like he was out to us," Cain said.



Freddy Sanchez, 7-for-13 after being moved to the leadoff slot for the first time this week, followed with a ground-rule double and Nate McLouth hit sacrifice fly to score Morgan.



Jason Bay's double tied the score, Jack Taschner relieved and, one out later, NL RBIs leader Xavier Nady was intentionally walked. LaRoche, who hit .174 in April, then lined a single to right just over the outstretched arm of a leaping Eugenio Velez.