PHOENIX (AP) — The San Francisco Giants were kicking the ball around so badly Monday night that manager Bruce Bochy wanted to start spring training over again.
Then the Giants' bats came alive, Arizona's bullpen wilted, and San Francisco rallied from four runs down to beat the Diamondbacks 9-8 on Buster Posey's two-run home run off new closer Addison Reed in the ninth inning.
"I think we want to be a team that keeps grinding and keeps pushing," Posey said. "It was nice to be able to do that tonight right out of the chute to give us that confidence that when we get down we know we have the ability to come back."
Posey's star turn didn't surprise Giants starter Madison Bumgarner, who left after giving up four unearned runs in four innings.
"He's on a different level, man," Bumgarner said. "He's so good and he's been that good since day one. It's fun to watch him play every day."
Posey had no experience against Reed, who came to the Diamondbacks in an offseason trade from the Chicago White Sox.
"I've never faced him before, spring training or anything," Posey said. "I was really just trying to get a pitch I can handle."
He got it on a fastball that he sent over the left field wall.
"For us to come back and win a game like that, it just shows you, you go hard for nine innings ," Bochy said. "These guys did and got some big hits later in the game. It seemed like it got contagious, then Buster came through for us in a big way.
It was the season opener for San Francisco and the first true home game for the Diamondbacks, who started the season with two losses as the home team against the Los Angeles Dodgers in Australia.
Miguel Montero, who had three hits and reached base five times, homered to lead off the Arizona ninth and make it a one-run game.
Brandon Belt had three hits, including a solo home run, and singled ahead of Posey's homer.
Arizona scored four unearned runs off Bumgarner in the fourth and led 7-3 after six. San Francisco got four runs with two outs in the seventh, with reliever Brad Ziegler walking in the tying run.
Jean Machi (1-0) pitched 1 2-3 innings of relief to get the victory. Reed (0-1), acquired from the Chicago White Sox in the offseason, got the loss. Sergio Romo, who gave up the home run to Montero, earned the save.
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