CINCINNATI -- Left-hander Travis Wood beat Cincinnati for the first time in his career, repeatedly pitching out of threats for seven innings, and the Chicago Cubs stalled the Reds' weeklong surge with a 2-0 victory Monday night.
Wood (9-11) finally beat the team that traded him after the 2011 season. He was 0-4 in his career, including three losses this season. He allowed six hits and fanned seven.
Kevin Gregg gave up a double in the ninth while earning his 31st save in 35 chances.
Ryan Sweeney and Luis Valbuena homered off Bronson Arroyo (13-11), who had won his last four starts against the Cubs.
The Reds were coming off a refreshing week -- six wins in seven games against the rival Cardinals and the NL West-leading Dodgers, leaving Cincinnati only 1½ games out in the NL Central. And with St. Louis idle Monday, the Reds had a chance to gain a half-game on first place.
Cincinnati hasn't been within a game of first place since May 25. The Reds have won a lot of close games and made up a lot of ground since falling a season-high 7 games out on Aug. 8.
Facing a team they have dominated, they wasted a chance to move closer.
Cincinnati is 13-4 against the Cubs this season. Overall, Cincinnati has won 12 of its last 15 and 22 of its last 27 against Chicago.
The last-place Cubs started their longest trip since the 2004 season, 11 games in 11 days. They also go to Pittsburgh and Milwaukee.
Sweeney hit his sixth homer in the second inning and Valbuena hit his 11th in the third. Valbuena's homer left him 6 for 12 career against Arroyo with two homers -- one of the few Chicago hitters with good results against the right-hander.
Arroyo allowed seven hits over seven innings, striking out six.
Wood was traded to the Cubs for left-handed reliever Sean Marshall after the 2011 season. He had pitched well against the Reds, allowing only two runs in three of his four starts against them this season. The problem was a lack of offense.
Didn't need it this time.
Wood forced Cincinnati to strand a runner at second base in the first, third, fourth, fifth and sixth innings. After Shin-Soo Choo doubled with one out in the fifth, Wood got Brandon Phillips and Joey Votto on called third strikes.
The Reds stranded seven runners in scoring position in seven innings.
Choo was hit in the back with the pitch in the third inning, the 25th time the leadoff hitter has been plunked this season. With that, Choo surpassed Jason LaRue for the club record.
Notes: It was the Cubs' sixth shutout this season. ... Reds SS Zack Cozart had two doubles, extending his hitting streak to a career-high 14 games. ... RHP Johnny Cueto continues to throw without pain. Cueto is on the DL for the third time this season with shoulder problems. The Reds haven't decided when he could pitch in a game or what role he might have. "You don't want to force him in there and end up hurting his shoulder," manager Dusty Baker said. "It's great to have him as a possibility." ... LHP Tony Cingrani (7-3) starts for the Reds on Tuesday, his second appearance since returning from back spasms. The Cubs go with Edwin Jackson (7-15), who leads the NL in losses.