It was Cincinnati Manager Dusty Baker's 1,500th career victory.
Votto ripped a double to right that drove in Drew Stubbs, who had reached on a two-out, broken-bat single. Phillips then drove in Votto with a bloop single to center.
After Braun's blast, Marshall got the next two outs before being replaced by Logan Ondrusek after Jonathan Lucroy and pinch-hitter Norichika Aoki singled back-to-back.
Ondrusek walked pinch-hitter George Kottaras to load the bases, then got his first major league save as pinch-hitter Travis Ishikawa popped up to left field.
The loss was tagged on Milwaukee closer John Axford (0-2), who gave up the three key hits after striking out the first two batters he faced in the ninth.