WASHINGTON—Jake Peavy mixed speeds, kept Washington hitters guessing and continued an impressive roll by White Sox starting pitchers.Peavy pitched a three-hitter for his fourth career shutout and the White Sox beat the Nationals 1-0 on Saturday for their season-high fifth straight victory. Peavy’s effort extended a dominant stretch by the White Sox rotation, which is 8-1 with a 1.81 ERA in its last 11 starts.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, worked out of a two-on, none-out jam in the first and 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. The Sox have 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.Ozzie Guillen made a visit to the mound before Peavy faced Dunn in the ninth with the tying run at second, but it lasted only seconds. Dunn was 5 for 28 with two homers against the right-hander.Washington has scored once in 20 innings over two games against the Sox, a trend Zimmerman said has to be reversed.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.The Sox improved to 9-2 in interleague play this season, while the Nationals fell to 3-8.Omar Vizquel led off the fourth with a bloop single to center. He 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, Riggleman was ejected by plate umpire Sam Holbrook for arguing balls and strikes.

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 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)…..The Sox have not homered in seven games, its longest skid since April 17-25, 1993, an eight-game drought.