By CHRIS DUNCAN
AP Sports Writer

HOUSTON(AP) -- Hunter Pence heads straight to the weight room
after most games. Makes sense, because he provided the muscle in
the Houston Astros' four-game sweep of Philadelphia.

Pence homered and drove in three runs on Monday in the Astros'
4-3 win over the NL East leaders. The Houston right fielder went
6 for 13 in the series with three home runs and eight RBIs.

"Not too long ago, I was in the biggest slump," he said. "Now,
I've caught a good streak and I'm hitting the ball well."

Pence hit a two-run homer and an RBI double in the finale for
the Astros, who've won eight of their last nine home games.
Michael Bourn drew a bases-loaded walk from Chan Ho Park to
force home the go-ahead run in the seventh inning.

Jose Valverde pitched a perfect ninth for his 22nd save in 26
chances and the Astros matched their longest winning streak of
the season at four.

"We got a good start to the homestand," Pence said. "It all
starts with pitching. The bullpen did great and we battled as
hitters."

Ryan Howard and Raul Ibanez hit back-to-back homers in the
fourth against Houston starter Brian Moehler. Howard also drove
in a run with a first-inning single.

The Phillies still have a comfortable lead in their division,
but manager Charlie Manuel is worried that his players are
starting to press as the team heads into the final month.

"I don't know what it is, if they're tight or whatever," Manuel
said. "They have no reason to be tight, but I kind of sense
that's what it is.

"This is September 7th. We're still in good position, but we've
got to play, man, we've just got to play."

The Phillies scored only 10 runs in Houston and were swept in a
four-game series for the first time since August 2008.

"It was a bad series and that's saying it lightly," Manuel said.
"We did everything we could to lose. You name it, every game, we
did everything we could to lose."

Jamie Moyer became the Phillies' last-minute starter when J.A.
Happ was unable to pitch because of a right oblique strain.
Moyer got a no-decision after allowing two runs and three hits
in six innings.

With the Phillies leading 1-0, Moyer walked Miguel Tejada in the
second and Pence drove a full-count pitch over the railroad
tracks in left. Pence is hitting .394 with four homers and 10
RBIs in his last 10 games.

"It's just baseball, you can't explain it," Pence said.
"Hopefully, I can keep riding it, keep going in there, trying to
get a good pitch and making a good swing."

Howard and Ibanez homered in the fourth, the second time this
season the two sluggers have connected in consecutive at-bats.

Moehler walked Ibanez and Jayson Werth with two outs in the
sixth and Sammy Gervacio relieved. Pedro Feliz walked on four
pitches to load the bases, but Gervacio got Carlos Ruiz to fly
out.

Moyer retired 11 in a row after Geoff Blum's single in the
second inning.

Bourn led off the Houston sixth with a line-drive single up the
middle that Moyer ducked to avoid. Moyer retired the next three
hitters to wrap up his 101-pitch outing.

Wesley Wright (3-2) replaced Gervacio in the seventh. He gave up
a double to Jimmy Rollins, but got the final two outs.

Park (3-3) relieved Moyer in the seventh and the Astros tied it
on back-to-back doubles by Tejada and Pence. Park then walked
three straight batters to give Houston a 4-3 lead.

Tim Byrdak and Jeff Fulchino combined to shut out the Phillies
in the eighth, setting up Valverde for the finish.

NOTES: The Phillies had back-to-back homers for the eighth time
this season. ... Happ called the injury "a freak thing" and
expected to make his next scheduled start this weekend. "I'd be
really frustrated if I did try to go today and suddenly, it's
six or seven starts instead of one or two," he said. "It's just
a frustrating situation." ... The Astros purchased the contracts
of infielder Chris Johnson and right-handed pitcher Billy Sadler
and recalled infielder Tommy Manzella from Triple-A Round Rock.
... Astros slugger Lance Berkman has not homered in 30 games,
the second-longest drought of his career.