By Jeremy Kahn

AP photo: The San Francisco Giants starter Jake Peavy fires a pitch in the third inning against Philadelphia Phillies on Friday night at AT&T Park

SAN FRANCISCO-Brandon Belt changed the outcome of this game with just one swing of the bat .

Belt hit a base clearing double with one out in the bottom of the seventh inning, as the San Francisco Giants came from behind to defeat the Philadelphia Phillies 5-4, before a sellout crowd of 42,238, the 444th consecutive regular season sellout at AT&T Park.

With that bases loaded double by Belt, the Giants raised their batting average with the bases loaded to .407 (24-for-59), the best in the major leagues.

This was the 31st win in 40 games for the Giants, their most wins in a 40-game span since going 31-9 from June 12-July 21, 1954. If you remember correctly, the New York Giants that season won the World Series in a four-game sweep over the Cleveland Indians.

With the victory, the Giants are now 21 games over .500 at 48-27, and are now seven games ahead of the second place Los Angeles Dodgers in the National League West, who lost earlier on Friday night by the final score of 8-6 to the Pittsburgh Pirates at PNC Park.

The Giants put together a rally in the bottom of the seventh inning, as Trevor Brown singled, and then pinch hitter Buster Posey lined a shot to centerfield that was just out of the reach of Herrera and Brown to advance to second base.

Span then sacrificed Brown and Posey an additional 90 feet for the first out of the inning. Then Joe Panik walked to load the bases to bring Belt to the

Freddy Galvis scored the Phillies second run of the game on a Odubel Herrera sacrifice fly in the top of the fifth inning.

Galvis led off the inning with a double went to third on a Peter Bourjos single, and then scored on the Herrera sacrifice fly.

The Giants took a 1-0 lead in the first inning, as Denard Span reached on a Ryan Howard error, and scored on a Angel Pagan with two outs just following a Brandon Crawford single of his own.

It looked like Jake Peavy was headed for his seventh loss of the season; however that changed in the bottom of the seventh inning and he picked up his fourth win of the season. Peavy went seven innings, allowing two runs on seven hits, walking two and striking out four.

On the other hand, Zach Efflin went six innings, allowing just one unearned run and striking out one; however he did not fare in the decision.

Things got a little interesting in the top of the eighth inning, as Maikel Franco tripled over the head of Span in centerfield, then after pinch hitter Tommy Joseph struck out for the second out of the inning, Cameron Rupp walked and then pinch hitter Tyler Goddel singled to load the bases, then Galvis singled to score Franco from third base.

Leading 5-3, and on their third reliever of the inning, Peter Bourjos walked to score Rupp to cut the lead down to 5-4; however Cory Gearrin was able to get pinch hitter Andres Blanco to ground out to Belt with Gearrin for the final out of the inning.

Javier Lopez came on in the top of the ninth inning to get Herrera, and then Bruce Bochy went to his usual closer Santiago Casilla, who was able to get Cesar Hernandez out on strikes; however he got into a bit of trouble, as walked Franco, allowed a single to Joseph and hit Rupp to load the bases for Goeddel.

Casilla was able to retire Goeddel on a bang bang play at first base, as Ramiro Pena made a great play with his glove and threw to Belt for what looked like the final out of the game; however Phillies manager Pete Mackanin challenged the call and after a 36 second review, the play stood and the Giants won their fourth in a row.

Bochy used Derek Law, Josh Osich, Gearrin, Lopez and Casilla, who picked up 17th save of the season.