The Triple-A Norfolk Tides fell to the Gwinnett Braves, while the Double-A Bowie Baysox topped the Harrisburg Senators.
The Single-A Frederick Keys beat the Salem Red Sox, and the short-season Single-A Aberdeen IronBirds were victorious over the Mahoning Valley Scrappers.
The Rookie-level Bluefield Orioles were edged by the Greeneville Astros, and the Rookie-level GCL Orioles blanked the GCL Rays.
The Single-A Delmarva Shorebirds were idle.
Score: Gwinnett Braves 4, Norfolk Tides 1 (Box score)
Recap: Starting pitcher David Pauley (7-8) committed three of the Tides' four errors in a 4-1 loss to Gwinnett. The 26-year-old right-hander allowed four runs (one earned) and 11 hits in six innings, and he collected eight strikeouts.
Norfolk designated hitter Steve Torrealba was 1-for-3 with a double and a run scored, but he also grounded into one of the team's three double plays in the game.
Tides relief pitcher Ross Wolf retired all six batters he faced, including two strikeouts.Bowie Baysox (AA)
Score: Bowie Baysox 6, Harrisburg Senators 2 (Box score)
Recap: Starting pitcher Brian Matusz (6-0) remained perfect for the Baysox in a 6-2 victory over Harrisburg. The 22-year-old left-hander gave up one run and four hits in seven innings, and he struck out four batters.
Bowie first baseman Eric Crozier was 3-for-3 with two walks, two RBIs and a run scored, and designated hitter Danny Figueroa was 2-for-3 with a triple, two walks and two runs scored.
Baysox second baseman Miguel Abreu collected two hits, two RBIs and a stolen base, while left fielder Jonathan Tucker added two hits and a run scored.
Former Orioles utility player Freddie Bynum picked up the only run against Matusz with a solo home run to lead off the third inning.
Score: Frederick Keys 5, Salem Red Sox 1 (Box score)
Recap: Starting pitcher Zach Britton (6-4) allowed one unearned run and three hits in seven innings, and the Keys cruised to a 5-1 win over Salem. The 21-year-old left-hander collected seven strikeouts and hit a batter.
Frederick shortstop Pedro Florimon Jr. was 2-for-4 with two doubles, an RBI and two runs scored, while catcher Caleb Joseph added two hits, including a double.
Keys third baseman Brandon Waring contributed a double, two RBIs and a run scored, and left fielder Tyler Henson collected two hits and an RBI.
Score: Aberdeen IronBirds 3, Mahoning Valley Scrappers 2 (Box score)
Recap: Designated hitter Levi Carolus was 1-for-3 with two RBIs in the IronBirds' 3-2 victory over Mahoning Valley at Ripken Stadium.
Aberdeen first baseman T.J. Baxter and third baseman Tyler Kelly each contributed two hits, while left fielder Richard D'Oleo added a single, a stolen base and a run scored.
IronBirds starting pitcher Nicholas Haughian (2-2) surrendered one run and five hits in six innings. The 22-year-old left-hander struck out three batters and issued one walk.
Relief pitcher James Brandhorst retired all six batters he faced to pick up his third save of the season for the IronBirds.
Score: Greeneville Astros 5, Bluefield Orioles 4 (Box score)
Recap: Catcher Dashenko Ricardo was 2-for-4 with a double and an RBI, but the Orioles lost, 5-4, to Greeneville at Bowen Field.
Bluefield third baseman Mike Flacco collected a double, and left fielder Michael Planeta added a triple and a run scored.
Flacco also committed his seventh error of the season, while infielder Gary Helmick picked up a stolen base as a pinch runner in the ninth inning.
Orioles starting pitcher Vito Frabizio (1-2) gave up two runs and four hits in six innings. The 20-year-old right-hander collected four strikeouts and hit a batter.
Score: GCL Orioles 10, GCL Rays 0 (Box score)
Recap: Third baseman Tyler Stampone was 2-for-4 with a a home run, a stolen base and four RBIs in the Orioles' 10-0 victory over the Rays.
Baysox second baseman Paco Figueroa contributed a triple and four RBIs in an injury rehabilitation assignment for Bluefield, while center fielder Edwin Cintron was 2-for-4 with a double and two runs scored.
Orioles starting pitcher Jario De La Cruz (2-1) tossed seven scoreless innings. The 22-year-old right-hander allowed two hits, walked two batters and collected five strikeouts.
Wade Townsend, who the Orioles selected in the first round of the 2004 MLB draft and couldn't agree on a contract, started for the Rays. It was the first appearance of the 2009 season for the 26-year-old right-hander. Townsend, who has been bothered by a series of injuries in his professional career, didn't allow any runs in one inning.