Gamel, publicly anointed Prince Fielder's replacement as far back as November, leads the Brewers with six spring home runs and 14 RBIs.
"It absolutely is important -- for him," manager Ron Roenicke said. "It's not important for me. It's important for him. I think the mental side of him going in, he's trying to take over a position where we were obviously pretty good. ... I don't feel that way, but he may. So any time he does something on the plus side, it's huge for him."
Milwaukee pitcher Chris Narveson allowed one hit over the first three innings before Jesus Guzman hit a three-run home run in the fourth inning. For Guzman, it was his fourth home run of the spring.
Narveson loaded the bases with no outs in the fifth inning but escaped big damage, allowing one run as he got Orlando Hudson to ground into a double play.
Narveson, who will be the Brewers' No. 5 starter, allowed five earned runs on seven hits in five innings. He walked two and struck out three.
Ryan Braun had a single in the first inning for the Brewers. He's now reached base in his last nine games and has hit safely in six of his last seven games.
"You look at [Braun's] last seven at-bats, and six of them have been bullets," Roenicke said. "You talk about Ryan turning it on and off, and he's one of the rare guys that probably can do that."
Alex Gonzalez had two hits for the Brewers, including a home run, his fourth of the spring. Teammate Carlos Gomez had two hits, including a three-run home run in the sixth inning. He also homered on Friday.
San Diego pitcher Tim Stauffer, who is the projected Opening Day starter on April 5, allowed six runs in the third inning. All told, Stauffer allowed six runs on seven hits in five innings with two walks and two strikeouts.
"I was able to get through five innings. My change up felt pretty good. Everything else was OK, not terrible," Stauffer said.
Kyle Blanks and James Darnell each had two hits for the Padres.
Up Next for the Padres: The Padres travel to Surprise on Sunday for a 1:05 p.m. game against the Rangers, their final Cactus League game of the spring. Cory Luebke, who on Friday got a contract extension from the team that guarantees him $12 million, gets the start. Luebke, who projects as the No. 2 starter in the rotation, will likely start on Friday against the Dodgers at Petco Park. He will go four innings on Sunday. Look for prospect Casey Kelly to also throw four innings. Kelly has had a strong spring and will begin the regular season with Triple-A Tucson.
Up Next for the Brewers: The Crew play their final Spring Training home game on Sunday at Maryvale Baseball Park, where they'll "show and go" against the Giants and Tim Lincecum. Roenicke is letting players sleep in for the first time in weeks, a welcome break before another noon game Monday, a busy split-squad Tuesday and one final exhibition against the D-backs at Chase Field on Wednesday wraps up the spring. Yovani Gallardo will oppose Lincecum on Sunday as both aces make their final tune-up for Opening Day.