WASHINGTON (AP) — Jake Peavy pitched a three-hitter for his fourth career shutout and the Chicago White Sox beat the Washington Nationals 1-0 on Saturday for their season-high fifth straight victory.

Peavy (6-5), whose scheduled start Thursday was pushed back two days because of an achy right shoulder, walked two and struck out seven as the White Sox moved within a game of .500 (33-34) for the first time since April 14, when they were 4-5.

The right-hander, who is 6-1 in his last seven starts against NL clubs, retired 20 Nationals in a row after Roger Bernadina's second-inning single. His previous shutout was Aug. 23, 2005, a 2-0 win for San Diego over Houston.

Carlos Quentin's RBI single in the fourth sent the Nationals to their season-worst sixth consecutive defeat. A.J. Pierzynski had three hits for Chicago, which has won nine of 10 overall.

Nyjer Morgan drew a leadoff walk in the Washington ninth and moved to second on Cristian Guzman's sacrifice bunt. Peavy then struck out Ryan Zimmerman looking and intentionally walked Adam Dunn before getting Josh Willingham on a popup to second.

Chicago improved to 9-2 in interleague play this season, while the Nationals fell to 3-8.

Washington starter J.D. Martin scattered eight hits over six innings but remained winless in seven starts since his last victory on Sept. 18, 2009. Martin (0-3) walked none and struck out a career-best six.

Omar Vizquel led off the fourth with a bloop single to center. Vizquel went to second on Mark Kotsay's groundout and scored when Quentin laced a two-out single to left.

After making a pitching change in the eighth, Nationals manager Jim Riggleman was ejected by plate umpire Sam Holbrook.

NOTES: Zimmerman struck out a season-high four times on a day when the Nationals distributed 15,000 bobblehead likenesses of him. ... Vizquel played his 99th straight errorless game. He hasn't made an error since Sept. 14, 2008. Vizquel is not scheduled to play on Sunday when Chicago manager Ozzie Guillen is expected to give Dayan Viciedo, who was recalled Friday from Triple-A Charlotte, his first major league start. ... The White Sox are the only team in the majors with a winning record (17-16) on the road, but a losing record at home (15-18). ... Chicago has not homered in seven games, its longest skid since April 17-25, 1993, an eight-game drought.