PITTSBURGH (AP) -- Jason Bay homered high and deep into the left-field bleachers Friday night, and thought it might've been the longest ball he's hit at PNC Park.
"I don't want to say it's irrelevant talking about distance and how far it went, but it's more important that we got the home run and we got the win," Bay said.
"I hate losing 1-0 games," Reds manager Dusty Baker said. "It won't take away the pain of losing tonight, but we're still getting good pitching. With good pitching, I feel we can win a bunch of games. I feel it coming."
The start of the game was delayed 20 minutes because of rain. There was another 62-minute delay in the top of the sixth when a severe thunderstorm hit that featured some heavy wind and hail.
With two outs in the bottom of that inning, Bay hit a full-count fastball from Jared Burton (0-1) for his second home run in the last three days.
"One bad pitch," said Burton, who has allowed only two hits -- both home runs -- in 6 2/3 innings this season. "You leave the ball up to a guy like Bay, he's not going to miss it too many times."
The Reds were shut out despite getting 14 runners. Brandon Phillips had two of the Reds' seven hits.
Maholm went 5 1/3 innings, allowing six hits and two walks with two strikeouts. He also hit a batter and committed an error to allow Norris Hopper to reach.
"It's not like they were blistering the ball all over the place," Maholm said. "They had some groundballs, I walked a couple guys, and it was just kind of about bearing down and concentrating on getting a groundball or getting a strikeout when you need it."
Grabow (1-0) emerged from the rain delay to work out of a two-on, one-out jam to earn the win. Marte induced Edwin Encarnacion to pop up with the bases loaded in the seventh, and Capps pitched a perfect ninth for his second save.
"We said all along if we can get deep into a game with a lead, we feel pretty good," Pirates manager John Russell said. "We've got some guys down there that are very capable of closing the game out. Marte did a great job, Grabow did another great job and then we turn it over to Capps and he does what he can do."
Reds starter Edinson Volquez allowed only three hits and three walks in five innings. He left after the long rain delay and Burton pitched the next two innings.
"We had our chances to score," Baker said. "We just couldn't get that one hit that we needed. Tonight was a bad outcome."
The Pirates' first homestand has featured long games. The team lost 12- and 15-inning contests against the Cubs this week. ... Reds C David Ross will continue his rehab at Triple-A Louisville. He missed most of spring training with back spasms and started the season on the 15-day DL. He began his rehab with the Reds' Florida State League team, going 2-for-11. ... McLouth was on base three times and extended his hitting streak to 10 games. He leads the majors in hits with 19 and has at least one in every game this season.