By Jeremy Kahn

AP photo: San Francisco Giants pitcher Jake Peavy greets Grant Green after Green hit a two run homer in the fourth inning at AT&T Park on Saturday vs. the Arizona Diamondbacks

SAN FRANCISCO-Grant Green gave the San Francisco Giants a lead that they would never relinquish with one swing of the bat.

Green hit a two-run home run off of Robbie Ray in the bottom of the fourth inning, as the Giants defeated the Arizona Diamondbacks 4-2 before a crowd of 41,571, the 453rd consecutive regular season sellout at AT&T Park.

Jake Peavy lasted only 4.1 innings, allowing two on seven hits, while walking one and striking out three; however he did not fare in the decision, as he failed to go the required five innings, despite the fact that he was leading when he was replaced by Javier Lopez.

The Giants jumped out to a 1-0 lead in the bottom of the third inning, as Angel Pagan singled, stole second and then Brandon Belt tripled to right-center field.

That would be the score for a half-inning, as Paul Goldschmidt doubled to lead off the fourth inning, then Jake Lamb and Yasmani Tomas hit back-to-back singles to tie up the game and then Brandon Drury untied the game with a single that scored Lamb.

Brandon Crawford led off the bottom of the fourth inning, and after a Mac Williamson fly out to Michael Bourn in centerfield, Green hit his first home run since August 30, 2015 at the Cleveland Indians at Progressive Field, while playing for the Los Angeles Angels of Anaheim.

George Kontos pitched an 1.1 innings to pickup his second win of the season, while Santiago Casilla notched his 22nd save of the season.

Casilla was the sixth reliever used by Bruce Bochy on the afternoon, following Javier Lopez, Kontos, Albert Suarez, Josh Osich, Sergio Romo and Casilla

The bullpen went a combined 4.2 innings, allowing one hit, one walk and striking out two.

With the victory, the Giants improve to 56-33, the best record in the major leagues and are now a season-high 23 games over .500.

The 56 wins by the Giants are the most wins by the team at the All-Star break since they won a San Francisco record 59 in 1993, and the 56 wins are the third-most since the Giants moved to San Francisco in 1958.