SAN FRANCISCO -- Edgar Renteria will begin a rehab stint at Triple-A Fresno on Monday and likely will join the Giants on their next road trip, manager Bruce Bochy said Sunday.

Renteria has been on the 15-day disabled list since May 26 with a strained right hamstring, which he has tested the past two days.

Bochy said Renteria will play shortstop for the Grizzlies, but where Renteria will fit into the Giants' lineup upon his return still is up in the air.

San Francisco finishes a three-game series with Baltimore on Wednesday and then travels to Toronto and Houston on a six-game, seven-day road trip.

Martinez likely to start Tuesday's game

SAN FRANCISCO -- As of Sunday, right-hander Joe Martinez is in line to start Tuesday against Baltimore, but Giants manager Bruce Bochy said Martinez still will be available out of the bullpen the next two days, if needed.

Martinez, 27, has a 5-2 record and 3.07 ERA in 11 starts at Triple-A Fresno this season. He started five games for the Giants in 2009, going 2-2 with a 7.61 ERA. He also posted a 1-0 record and 7.11 ERA in four relief appearances last season.

Martinez was recalled Friday when right-handed starter Todd Wellemeyer was placed on the 15-day disabled list with a right quad strain.

Bochy said the reason Martinez was recalled, rather than highly touted prospect Madison Bumgarner, was because Martinez was scheduled to throw Friday. Bochy also said Bumgarner's recent ejection and suspension did not factor in the decision.

Sandoval gets first start batting second

SAN FRANCISCO -- With Freddy Sanchez getting the day off Sunday, Giants manager Bruce Bochy opted to bat Pablo Sandoval second in the Giants' batting order.

Infielder Matt Downs started at second base in place of Sanchez, batting eighth.

"Downs just hasn't gotten to play a lot, so I decided we'd give Pablo the extra at-bat," Bochy said. "A lot of the times you like to keep the order the same, but this allows me to put Bengie [Molina] into the seven-hole, and Downs can run so we can do some things with him in the eighth-hole."

Sandoval has recently dropped in the order, hitting seventh twice and eighth once, but went 1-for-3 with a home run Saturday.

Sunday marked Sandoval's first time starting a game hitting second in the lineup.