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07/06/12 2:56 AM ET

Pablo has MRI set to determine injury's severity

SAN FRANCISCO -- Pablo Sandoval left Tuesday's 3-2 win over the Padres after a spectacular double play might have stretched him too far, departing with what the team said was a strained left hamstring.

Giants manager Bruce Bochy said Sandoval will have an MRI exam on Wednesday, which will let them know how long Sandoval will be out, but Bochy said he expects him to be out for at least a few games.

"We'll just have to find out the extent of it tomorrow," Bochy said. "Hopefully we'll get some good news."

Getting the start at first base for the second straight game, Sandoval nearly did a full-on splits to complete a double play to end the third inning after diving second baseman Ryan Theriot flipped the ball to shortstop Brandon Crawford, who lept over a sliding Chase Headley to make the throw to first after tagging second.

Sandoval slowly walked off the field in noticeable pain, and was later replaced by pinch-hitter Brandon Belt in the bottom half of the inning.

Sandoval, an All-Star at third base, was back starting on the other side of the diamond as Bochy tries to help Belt out of his slump, with Joaquin Arias getting the start at third base.

Belt went 0-for-2 on Tuesday, giving him just one hit in his last 26 at-bats. He has struck out nine times in his last 22 at-bats.

"You give a guy a day sometimes, and you plan on giving him a couple days," Bochy said before the game. "Really, that was my plan, but I didn't want to tell Brandon that."

Bochy had been impressed with Sandoval's play at first base, particular in Monday's game, when Sandoval made a run-saving diving catch in the fourth inning.

"I thought Pablo looked really comfortable there at first base," Bochy said before Tuesday's game. "He made a nice play going to his right there."

Giants enlist fans in Designated Driver Challenge

SAN FRANCISCO -- The Giants will take their competition with the in-state-rival Dodgers and Padres off the field with a Designated Driver Challenge to deter drinking and driving from the three clubs' respective ballparks.

During each team's home games this season, fans can earn a "run" for their team by pledging to be a designated driver at special booths located throughout the three ballparks.

To qualify, fans must be over the age of 21, have a valid driver's license, promise not to consume alcohol at the game and pledge to ensure a safe ride home from the game for others.

"We're proud to see Giants fans embracing the use of designated drivers," Giants senior vice president of ballpark operations Jorge Costa said in a news release. "We want our fans to have an enjoyable experience at the park, but most importantly, we want them to return home safely after every game."

The competition is sponsored by Anheuser-Busch, and if the Giants win the Budweiser Good Sport Designated Driver Challenge, Anheuser-Busch will donate $1,000 to the Giants Community Fund.

The Giants host the Dodgers at AT&T Park in a three-game series starting on Friday.

Jay Lee is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.