Before the All-Star break, the Giants dropped Matt Cain three spots to the bottom of their rotation to give him extra rest for a bothersome elbow. Now on the 15-day disabled list, he'll be getting more time off than anybody hoped, and Yusmeiro Petit will start in his place Tuesday.
Petit is 3-3 with a 3.86 ERA in 26 outings this season, but is just 1-2 with a 5.81 ERA in five starts. The righty allowed one run on two hits in six innings in his last start, May 31 against the Cardinals. He threw six shutout innings in 2009 in his lone career start against Philadelphia.
The Giants plan for Petit to serve as their fifth starter until Cain returns.
He'll be opposed Tuesday by Roberto Hernandez, who's coming off his strongest outing of the season. He allowed just one run on three hits in eight innings against the Brewers on July 9. The key? He successfully attacked low in the zone.
"I know that teams like to swing," Hernandez said after the start. "The key for the game today was to keep the ball down, and the ball moved with every pitch. Ground balls ... that was the key for the game."
The Phillies had lost six of Hernandez's previous seven outings. He is 0-1 with a 5.06 ERA in two career starts against the Giants. He was tagged for three runs on eight hits in 4 2/3 innings against San Francisco last August.
Phillies: Roster uncertainty abounds
Manager Ryne Sandberg was never mentioned in trade rumors as a player, but he's become plenty familiar with them as a manager, since numerous Phillies have been linked in trade rumors as the July 31 Trade Deadline nears.
Sandberg acknowledged this can be a tough time for players, but he has liked how his have dealt with the uncertainty.
"Being around the guys, on the bench, during the game, I don't hear a lot of talk," Sandberg said. "Once the game starts, it's time for business. I think that's a credit to the guys. It's about playing the game, winning the game and the job at hand once it's baseball time. The guys have come to the ballpark and showed up with that attitude."
He knows the chances are high that his clubhouse will look a bit different within the next two weeks, but he hasn't given it much thought.
"Basically, rumors are rumors and until something develops or happens and there are changes, you deal with it then," Sandberg said. "Other than that, it's just a positive vibe, a positive attitude about the game played each day."
Giants: Duvall returns with a bang
Welcome (back) to the Majors, Adam Duvall.
Duvall, 26, was called up Monday after Brandon Belt was placed on the seven-day disabled list with a concussion, and Duvall quickly made a big impact, as he hit a two-run home run to center field off Cliff Lee in his third at-bat.
The blast was welcome production from the bottom half of the order, which has struggled mightily for much of the last two months.
Belt is eligible to return Sunday. The better Duvall fares, the less Belt will be missed.
• The Phillies are 19-30 at Citizens Bank Park this season.
• The Giants are 40-15 when they hit at least one home run.
Ryan Hood is an associate reporter for MLB.com. Follow him on Twitter @ryanhood19. This story was not subject to the approval of Major League Baseball or its clubs.