HOUSTON — The Astros had no problem getting runners on base Tuesday night. It was getting them home that proved impossible.
"That's a lot of traffic on the bases," Astros manager A.J. Hinch said. "We just weren't able to get that hit that catapulted us."
Peacock (0-1) allowed five hits and three runs in five-plus innings after being activated from the disabled list Tuesday. He made one rehabilitation start at Triple-A Fresno as he recovered from offseason hip surgery.
"(He) battled all night and got out of some tough spots there," catcher Jason Castro said.
It was the Astros second shutout of the young season. Houston fell to 1-5 when scoring two or fewer runs.
Graveman (1-1) yielded four hits in 5 1-3 innings for his first major league win to bounce back from his 2015 debut when he allowed eight runs in 3 1-3 innings.
The Athletics were up by 1 in the sixth inning before an RBI double by Billy Butler that gave him the American League's only nine-game hitting streak. Stephen Vogt added a run with an RBI single later in the inning to make it 3-0.
Houston out-hit Oakland 8 to 7, but the Astros couldn't push across any runs as they went 0-for 7 with runners in scoring position.
"We've been having some good at-bats," Castro said. "Guys are starting to hit the ball hard. Obviously you can't control hitting balls at guys, and we had quite a few of those in the Texas series. Had a few tonight."
Peacock pitched a 1-2-3 fifth before running into trouble in the sixth. He walked Zobrist to start the inning and was chased on the double to right field by Butler that made it 2-0.
Joe Thatcher took over and Vogt's single with one out sent Butler home to push the lead to 3-0.
The Astros had runners at first and second with one out in the sixth when Graveman was replaced by O'Flaherty. He quickly ended the inning when Castro grounded into a double play.
Right fielder Josh Reddick robbed Gattis of a hit when he grabbed his fly ball on the warning track for the second out of the eighth inning. Luis Valbuena and Chris Carter hit consecutive singles after that, but they were left stranded when Reddick caught a long fly ball hit by Castro.
"That's an example of kind of how it is," Castro said. "Got a couple of guys on base and I put a pretty decent swing on it, and it just happened to hit it right at Reddick."
Astros: Houston starter Brett Oberholtzer, who opened the season on the disabled list with a blister on his left index finger, could throw off the mound soon after playing long toss without a bandage on his injured finger for the second straight day on Tuesday.
Former Houston Rocket and seven-time NBA All-Star Tracy McGrady threw out the ceremonial first pitch before the game. McGrady, who pitched briefly last season for the Sugar Land Skeeters in the Independent Atlantic League, threw a strike.
Athletics: Left-hander Drew Pomeranz looks to extend a 15-inning scoreless streak dating back to last season when he makes his second start. He tied a career high with seven scoreless frames in a 12-0 win over Seattle on Friday.
Astros: Collin McHugh will try to stretch his career-long winning streak to nine games in his second start. He allowed one run in six innings against Texas on Friday to give him the longest winning streak by an Astros pitcher since Roy Oswalt won nine straight decisions from August 23, 2006-April 17, 2007.
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