PHOENIX — Buster Posey hit a two-run homer off new Arizona closer Addison Reed in the ninth inning and the San Francisco Giants rallied from four runs down to beat the Diamondbacks 9-8 on Monday night.
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 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 starter Madison 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.
With two outs in the seventh, pinch-hitter Ehire Adrianza doubled in a run, ending Arizona starter Brandon McCarthy’s night. Oliver Perez came in and gave up three hits without an out, including an RBI double by Angel Pagan’s RBI double and Pablo Sandoval’s run-scoring single. Ziegler relieved Perez and gave up a single to Posey to load the bases, then walked Hunter Pence for the tying run.
The Diamondbacks greeted reliever Yusmeiro Petit with four consecutive hits in the fifth, including a leadoff double by Martin Prado, followed by Trumbo’s RBI single. Parra got his third RBI of the night with a ground out and Arizona led 6-2.
On Tuesday night, Trevor Cahill (0-1) pitches for Arizona, Matt Cain goes for the San Francisco.