The Red Sox will send Justin Masterson to the mound at Camden Yards for his second straight start against the Orioles on Saturday. His opponent will be Miguel Gonzalez, whose last start also was against the Red Sox. Masterson is the only Boston pitcher with two wins, but his numbers don't necessarily reflect his 2-0 record. He has gotten good run support from the Red Sox offense, as the Sox have scored 21 runs in his three outings. The 30-year-old owns a 5.74 ERA, a 1.40 WHIP and a .233 batting average against. He has not thrown more than six innings and has gone past five just once. Masterson is the only member of the starting rotation who is yet to give up a home run. In his last start, a 7-1 Red Sox win against Baltimore in a rain-shortened game, Masterson went five innings, allowing one run on three hits, three walks and six strikeouts. The Orioles' lone run came in the second inning on an RBI double by Ryan Flaherty. "The slider was working real good," Masterson said after the game. "That's what helped me in 2013 and helped me to be a better pitcher. The best way to do that is to throw it for strikes in good counts. It will be beneficial for me just like it was when I had success." In nine career games and seven starts at Camden Yards, Masterson has a 2-4 record with a 7.71 ERA, a 1.738 WHIP, 42 strikeouts and 17 walks. Masterson's opponent will be one of the Orioles' better pitchers this season. Chen is 1-2 and has a 3.07 ERA, a 1.30 WHIP and a .212 batting average against. He has struck out 11 and walked eight. The 29-year-old native of Taiwan has not gone longer than six innings in any of his three starts. On Monday against the Red Sox, Chen went 4 1/3 innings and allowed five runs on three hits, five walks and three strikeouts. However, none of the runs scored were earned, as Baltimore committed three errors in the game. After Monday's outing, Chen's record against the Red Sox dropped to 5-4 in 12 starts. He has a 3.97 ERA, a 1.441 WHIP, 54 strikeouts and 18 walks through 68 innings. Red Sox vs. Chen (LHP) Dustin Pedroia (33 plate appearances): .517 AVG/.563 OBP/.759 SLG, 1 triple, 1 double, 5 RBIs, 3 walks David Ortiz (27): .348/.370/.522, 1 home run, 1 double, 6 RBIs, 2 walks, 4 strikeouts Mike Napoli (21): .167/.286/.556, 2 HRs, 1 double, 3 RBIs, 3 walks, 5 strikeouts Daniel Nava (17): .438/.471/.625, 1 HR, 3 RBIs, 1 walk, 4 strikeouts Shane Victorino (14): .333/.429/.583, 1 HR, 2 RBIs, 1 walk, 2 strikeouts Xander Bogaerts (13): .273/.385/.545, 1 HR, 1 RBI, 2 walks, 2 strikeouts Ryan Hanigan (13): .200/.385/.500, 1 HR, 2 RBIs, 2 walks, 2 strikeouts Mookie Betts (6): .167/.167/.167 Brock Holt has one walk, one strikeout and one RBI in eight plate appearances vs. Chen. Allen Craig has one walk and three strikeouts in five plate appearances vs. Chen. Pablo Sandoval is 0-for-3 in three plate appearances vs. Chen. Hanley Ramirez is 0-for-1 in one plate appearance vs. Chen. Sandy Leon has not faced Chen. Orioles vs. Masterson (RHP) Alejandro De Aza (41): .306/.375/.389, 1 HR, 4 RBIs, 4 walks, 3 strikeouts Adam Jones (36): .233/.361/.400, 1 triple, 3 doubles, 3 RBIs, 4 walks, 3 strikeouts Chris Davis (21): .211/.286/.474, 1 HR, 2 doubles, 2 RBIs, 2 walks, 9 strikeouts Delmon Young (21): .150/.143/.200, 1 double, 2 RBIs, 5 strikeouts Ryan Flaherty (13): .600/.692/1.100, 1 HR, 2 doubles, 5 RBIs, 1 strikeout David Lough (11): .375/.500/.375, 1 RBI, 2 walks, 1 strikeout Manny Machado (11): .300/.364/.700, 1 HR, 1 double, 3 RBIs, 1 strikeout Jimmy Paredes (3): .333/.333/.667, 1 double, 1 strikeout Travis Snider (3): .333/.333/1.000, 1 triple Everth Cabrera has one strikeout in two plate appearances vs. Masterson. Ryan Lavarnway has two strikeouts in two plate appearances vs. Masterson. Caleb Joseph and Steve Pearce have not faced Masterson.