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8/3/2013 12:30 A.M. ET

Giants accept Zito's offer to move to bullpen

ST. PETERSBURG -- Making a seemingly inevitable switch, the Giants removed Barry Zito from their pitching rotation Friday, with the left-hander's blessing.

Giants manager Bruce Bochy replaced Zito with Guillermo Moscoso, who will start Sunday's series finale against the Tampa Bay Rays.

Zito said that he approached Bochy after allowing four runs in 3 1/3 innings last Tuesday at Philadelphia and suggested that a change might be necessary.

"I came into his office after I pitched and I said I'm hurting the bullpen by not going six, seven innings," Zito said. He and Bochy subsequently discussed the option of a move to the bullpen, though the switch wasn't announced immediately.

"I told him I'm not getting down on myself or losing confidence or desire or inspiration," Zito added.

Zito's spot in the rotation seemingly has been in jeopardy for much of the season. He's 4-8 with a 5.09 ERA in 21 starts, including 0-7, 9.97 in nine road assignments. The Giants are 2-8 in the last 10 games started by Zito, who's 0-5 with a 6.66 ERA in that span. He has one victory in his last 17 outings.

The contrast is stark between this year and last season, when the Giants were winners in Zito's final 14 starts, including the postseason.

Bochy said that during the foreseeable future, Zito, who's in the final season of a seven-year, $126 million contract, will perform in long relief.

Bochy mentioned that another factor in Zito's demotion is the imminent return of right-hander Ryan Vogelsong, who could be activated from the disabled list after making his fourth Minor League injury rehabilitation start this Sunday. Vogelsong can easily occupy Zito's spot in the rotation, since he's pitching on the same schedule -- unless Moscoso pitches well enough to deserve another start.

Mostly, Bochy decided that it simply was time for a change, given Zito's struggles.

"How long this will be, I can't tell you," Bochy said. "But it was time to mix it up, change it up."

Bochy acknowledged that the Giants have discussed trying a six-man pitching rotation once Vogelsong returns, which could be as soon as next Friday. But that would require expanding the pitching staff from 12 to 13 men, Bochy said.

Belt returns to first, likely to sit Saturday

ST. PETERSBURG -- Brandon Belt reclaimed first base in Friday night's series opener against the Tampa Bay Rays, but Brett Pill remained very much in Giants manager Bruce Bochy's plans.

Bochy acknowledged that he wasn't certain how he would divide playing time for the rest of the year between Belt, San Francisco's primary first baseman for most of the season, and Pill, who went 7-for-13 with a home run and four RBIs as the Giants won two of three games in their previous series at Philadelphia.

Bochy's choices were simple for the first two games of the Tampa Bay series. Right-hander Chris Archer, who started Friday night's series opener, had limited right-handed batters to a .135 batting average, making the left-handed-swinging Belt a more logical choice than Pill.

The situation will be reversed Saturday, when Pill likely would get better swings than Belt against dominant Rays left-hander David Price.

"We're trying to get the matchups that we want," Bochy said.

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.