"Certainly, it's a good sign," Braun said. "I would rather homer than strike out, especially staying through the middle, hitting the ball the other way. When I'm going my best, that's what I do."
Braun began hitting and throwing well ahead of Christmas in an effort to be ready to play all nine innings by March 8, when Team USA plays its first Classic game against Mexico. He is already planning to ramp up his workload with back-to-back games on Monday and Tuesday.
His first-inning home run came right after Oakland missed a chance to take an early lead against Brewers starter Mike Fiers, who loaded the bases with two outs in the top of the first inning before striking out Chris Young on three pitches. Fiers returned to work a 1-2-3 second inning before calling it a day, after allowing one hit and two walks in two scoreless innings.
The Braun homer was Milwaukee's only hit against Chavez, who walked two batters in two innings.
The Brewers tacked on another run in the fourth inning on Jean Segura's RBI groundout, and Oakland answered in the seventh when Shane Peterson greeted Brewers reliever Santo Manzanillo with a double and scored on Michael Choice's single.
In his unofficial A's debut, shortstop Hiroyuki Nakajima walked and struck out. He also teamed with second baseman Jemile Weeks to turn a highlight-reel double play in the second inning.
"The environment and the ambience were fabulous, and it pumped me up," Nakajima said through a translator.
Brewers up next: After Mike Fiers made a successful scoreless debut on Saturday, it's another young starter's turn on Sunday at Maryvale Baseball Park against the Indians. Right-hander Mark Rogers will pitch for the first time since Aug. 31, after which the Brewers preemptively shut him down to protect his arm. Rogers was 3-1 with a 3.92 ERA in seven starts for Milwaukee last season, and is among four pitchers vying for three openings in the rotation. The 2:05 p.m. CT game will be webcast via Brewers.com.
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter at @AdamMcCalvy. This story was not subject to the approval of Major League Baseball or its clubs.