PHOENIX -- Giants prospect Brandon Belt hit a three-run double in the seventh inning as part of a six-run rally that sent the Giants to a 10-9 win over a Brewers split squad at Maryvale Baseball Park on Monday.
Belt finished with three hits and four RBIs in his first Cactus League start. After his second hit made it 7-5, the Giants tacked on three more runs thanks to a pair of Brewers errors.
"Obviously I have a little bit more confidence now," said Belt. "The past few games I was coming in late, getting an at-bat a game. I was probably pressing a little bit because I wanted to get that first hit. But today I could kind of relax a little bit more and just do my thing, since I knew I was going to have a couple of at-bats. Now I just have to be consistent with that."
Right-hander Mike McClendon took the loss for Milwaukee. Giants reliever Javier Lopez (1-0) won despite allowing three runs in the bottom of the sixth inning, including Brendan Katin's two-run home run.
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Mark DeRosa hit a two-run home run for the Giants and finished 2-for-3. He's 6-for-8 in three games this spring.
Right-hander Shaun Marcum, one of the Brewers' key offseason additions to the starting rotation, retired the first four hitters he faced but surrendered solid hits to the next four as the Giants built a 2-0 lead. Marcum struck out three batters in his two-inning Brewers debut.
"I got accomplished what I needed to get accomplished: Get out there in a competitive mode again," Marcum said. "Everything felt pretty good. I just need to work on locating some of those [fastballs] a little better."
The Brewers answered in the bottom of the second inning against San Francisco starter Barry Zito, who surrendered two runs on two singles and three walks. Jeremy Reed singled home the Brewers' first run, and Prince Fielder drew a five-pitch walk with the bases loaded to tie the game at 2.
Zito issued five walks in his 1 2/3 innings.
Giants up next:
Tim Lincecum will make his second start of the Cactus League season Tuesday as the Giants entertain the Chicago Cubs at Scottsdale, Ariz. San Francisco's Opening Day starter allowed three runs and five hits in 1 2/3 innings during last Friday's exhibition opener. Fellow right-hander Ryan Dempster will start for the Cubs. The Giants are hoping that second baseman Freddy Sanchez, who has worked hard to recover from left shoulder surgery last December, can appear in his first game. Sanchez feels confident that he can play without restrictions.
Brewers up next: Highly touted offseason addition Zack Greinke will make his unofficial Brewers debut Tuesday in Glendale, Ariz., against Mark Buehrle and the White Sox. It's a matchup of potential Opening Day starters, though Brewers manager Ron Roenicke continues to be coy about his plans for the pitching rotation. Greinke's case to start March 31 in Cincinnati over incumbent ace Yovani Gallardo is bolstered by that 2009 American League Cy Young Award on his mantle.
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter @AdamMcCalvy. This story was not subject to the approval of Major League Baseball or its clubs.