HOUSTON — When Houston ace Roy Oswalt returned to the dugout after hitting his first career home run Wednesday night, his teammates gave him the silent treatment.

No high-fives, no congratulations, no smiles.

Luke Scott was the first Astro to crack, and the rest of the team finally let Oswalt in on the joke.

"They straight-faced me. It was pretty good," Oswalt said after the Astros' 14-1 rout of the Pittsburgh Pirates. "I knew what was going on. It was pretty nice."

Oswalt's two-run shot off Pittsburgh starter Shawn Chacon was the most notable of Houston's season-high six homers.

Aubrey Huff connected twice and drove in a career-high six runs, and Jason Lane hit a two-run homer while pinch-hitting for Oswalt in the seventh. Craig Biggio and Scott added solo shots for the Astros, who have won six of eight. Huff also had a three-run double, and Scott hit an RBI single.

The Pirates allowed six homers in a game for the first time since Aug. 4, 2002, against San Francisco.

Oswalt said he's already asked the Astros to help him track down the fan in the left-field seats who caught his second-inning drive.

"It was pretty exciting," Oswalt said. "It felt like winning the first game in the big leagues. Pretty much the same thing. I always wanted to get at least one."

Oswalt (9-7) won for the third time in four starts, allowing four hits and striking out six in six innings. Freddy Sanchez ruined the shutout bid with an RBI double in the sixth.

"Today was just one of those days where we couldn't do anything wrong," said Biggio, who homered for the second straight game.

Chacon (1-1), acquired from the New York Yankees for Craig Wilson on July 31, lasted only 1 2-3 innings, leaving with the Astros up 6-0.

Houston came into the game with 24 homers since the All-Star break, and Biggio started Wednesday's outburst in the first inning, sending an 0-1 pitch into the left-field seats. His seventh homer since July 26 was his fourth in five home games against Pittsburgh this season.

Chacon walked Lance Berkman before Huff hammered his first home run of the night to left, only a few rows from where Biggio's landed.