On Friday, the Brewers exploded for eight runs in the final three innings to beat the Astros, 8-2.
Milwaukee was coming off a disastrous series against St. Louis, in which it was swept in three games and outscored by an 18-8 margin. But the NL Central- leading Brewers rebounded with Friday's win, and extended their advantage over the second-place Cardinals to 8 1/2 games.
"Prince looked really good today at the plate," Milwaukee manager Ron Roenicke said of Fielder, who finished 4-for-4. "His rhythm was great, his swings were great. Even the balls he was fouling back. And he's also seeing the ball really well."
Lucas Harrell was recalled from Triple-A Oklahoma City to make his first start with the Astros, who claimed him off waivers from the White Sox in July. The right-hander pitched 5 1/3 shutout innings, allowing three hits and two walks, to put Houston in position to win.
"I feel like I got in a groove a little bit later on," Harrell said. "You're always a little bit nervous, a little excited. I feel like after I got through a few innings it went a little bit better."
But the Astros' bullpen failed -- Aneury Rodriguez (1-6) was responsible for three runs in the seventh, David Carpenter allowed McGehee's homer and Jordan Lyles gave up three runs in the ninth as Houston had its four-game win streak broken.
Heading to the hill for the Brewers tonight will be lefty Chris Narveson, who has won his last three decisions and is 9-6 with a 4.28 ERA. Narveson hasn't started since August 22 when he tossed 5 1/3 scoreless innings to beat Pittsburgh.
Narveson beat the Astros the last time he faced them, but is 1-2 in eight games (seven starts) against them with a 4.38 ERA.
Houston, meanwhile, will counter with righty Bud Norris, who is 6-8 with a 3.68 ERA. Norris did not get a decision on Sunday in San Francisco, but pitched well as he surrendered two runs and three hits in seven innings. He also struck out 10 in the 4-3 win.
"I wanted to go deep into the game, which I did, and give these guys a chance to win," Norris said.
Norris has faced the Brewers six times and is 3-1 against them with a 3.50 ERA.
The Brewers have won seven straight versus the Astros and 10 of the 13 overall meetings this year.