(Sports Network) - The Boston Red Sox try for their fourth straight road win this evening, when they attempt to complete a three-game sweep of the Baltimore Orioles at Camden Yards.

Boston continued to thrive without Manny Ramirez on Tuesday, as Kevin Youkilis hit a two-run homer and Daisuke Matsuzaka remained perfect on the road to help the Red Sox to a 7-2 win.

Matsuzaka (15-2) pitched five innings and allowed two runs on six hits to improve his 2008 road record to 7-0 (10 starts). Jason Varitek homered and ended with two RBI for the Red Sox, who have won six of their last eight games overall.

Boston, which has won 12 of 17 since Ramirez was dealt to the Dodgers on July 31, still trails Tampa Bay by 4 1/2 games for first place in the American League East, but holds a 1 1/2-game edge on the Minnesota Twins in the wild- card race.

Ramon Hernandez and Luke Scott both drove in a run for Baltimore, which has dropped three of four. Daniel Cabrera (8-8) suffered the loss after he surrendered six runs on nine hits in 4 1/3 innings.

As if things were not bad enough for Baltimore, the placed closer George Sherrill on the 15-day disabled list prior to the game with left shoulder inflammation.

Boston will turn to young right-hander Clay Buchholz, who hasn't won since May 2 and is a miserable 2-8 with a 6.35 earned run average on the season. Buchholz hasn't started since August 10, when he was lit up in three innings by the Chicago White Sox, who managed five runs and seven hits off of the 24- year-old hurler.

Buchholz no-hit the Orioles last season in just the second start of his big league career. He also lost to them on July 11 and is 2-1 against Baltimore with a 2.12 ERA in three games (2 starts).

Baltimore will turn to left-handed rookie Chris Waters, who will be making just the fourth start of his career. After tossing eight scoreless innings of one-hit ball in his debut, Waters has recorded back-to-back no-decisions.

On Friday against the Detroit Tigers, Waters did not factor in the decision of his team's 11-2 win. He allowed a pair of runs and eight hits in 4 2/3 innings.

Boston, which has won eight of its last 12 at Camden Yards, has taken nine of its 14 matchups with the Orioles this season.