The Single-A Frederick Keys edged the Salem Red Sox, but the Single-A Delmarva Shorebirds lost to the Asheville Tourists.
The short-season Single-A Aberdeen IronBirds were beaten in extra innings by the Brooklyn Cyclones.
The Rookie-level Bluefield Orioles failed to score against the Princeton Rays, and the GCL Orioles were topped by the GCL Red Sox.
Orioles reliever Chris Ray, who pitched in an injury rehabilitation assignment for the Baysox tonight, seemed impressed by Matusz's performance.
"I mean, 7-0 isn't bad for a first-year guy at Double-A," Ray joked after the game. "What surprised me is how level-headed he is and what a good kid he is."
Norfolk Tides (AAA)
Score: Durham Bulls 7, Norfolk Tides 5 (Box score)
Recap: First baseman Michael Aubrey hit a solo home run, walked once and scored twice in the Tides' 7-5 loss to Durham.
Tides left fielder Joey Gathright added two hits and a run scored, while catcher Robby Hammock contributed a double and an RBI.
Starting pitcher David Pauley (7-9) gave up six runs and nine hits in 4 2/3 innings for the Tides. The 26-year-old right-hander struck out six batters and issued five walks.Bowie Baysox (AA)
Score: Bowie Baysox 6, Connecticut Defenders 0 (Box score)
Recap: It was another dominating performance for Matusz (7-0).
The 22-year-old left-hander tossed seven scoreless innings to remain perfect since being promoted to Double-A in the middle of June. Matusz allowed four hits, collected six strikeouts and walked three hitters -- all in the fourth inning.
"I had that one tough inning where I wasn't gripping it the way I should," Matusz said. "I kind of got out of the groove at the same time, but I was able to manage with it and get through that tough inning."
Ray issued one walk in one inning, but he stranded the runner during an injury rehabilitation assignment for the Baysox.
"I threw some strikes with my [off-speed pitches] tonight, which was an improvement," Ray said. "They were down in the zone."
Baysox center fielder Danny Figueroa was 1-for-2 with an RBI and two runs scored, and second baseman Paco Figueroa collected a double, two RBIs and a stolen base.
Bowie designated hitter Ambiorix Concepcion was 1-for-3 with an RBI, a stolen base and a run scored, while left fielder Jonathan Tucker added a single and a run scored.
Frederick Keys (A)
Score: Frederick Keys 4, Salem Red Sox 3 (Box score)
Recap: Center fielder Matt Angle was 2-for-4 with three stolen bases and two runs scored in the Keys' 4-3 win over Salem at Harry Grove Stadium.
Frederick second baseman Ryan Adams was 2-for-3 with a home run and two RBIs, while shortstop Pedro Florimon Jr. added a single, a stolen base and an RBI.
Keys starting pitcher Zach Britton (7-4) allowed three runs and seven hits in 7 2/3 innings. The 21-year-old left-hander struck out four batters, issued one walk and threw a wild pitch.
Relief pitcher Ryan Rodriguez retired the final four batters to pick up his fourth save for the Keys. The 25-year-old left-hander hasn't allowed a run in 10 games since being sent back to Frederick from the Baysox.
Delmarva Shorebirds (A)
Score: Asheville Tourists 9, Delmarva Shorebirds 2 (Box score)
Recap: Starting pitcher Oliver Drake only surrendered two runs (one earned) and five hits in five innings, but the Shorebirds' bullpen fell apart in a 9-2 loss to Asheville.
Delmarva relief pitcher Brent Allar (1-4) gave up six runs (five earned), four hits and three walks in one inning. The 24-year-old right-hander recorded one strikeout.
Shorebirds right fielder Ronnie Welty was 2-for-4 with a double and a run scored, and third baseman Tyler Kolodny added a double.
Designated hitter Joe Mahoney was 1-for-3 with an RBI and a run scored for Delmarva, while second baseman L.J. Hoes collected a single and an RBI.
The Shorebirds committed four errors in the game, while Asheville made three defensive miscues.
Aberdeen IronBirds (A)
Score: Brooklyn Cyclones 3, Aberdeen IronBirds 2, 14 innings (Box score)
Recap: First baseman T.J. Baxter collected two hits and scored a run, but the IronBirds blew a two-run lead in a 3-2 loss to Brooklyn in 14 innings.
Aberdeen starting pitcher Colin Allen tossed six scoreless innings, but he didn't factor in the decision. The 22-year-old right-hander struck out seven batters and only allowed three hits.
IronBirds relief pitcher Brian Sisk (0-1) suffered the loss after giving up one run and one hit in two-thirds of an inning.
Center fielder Steve Bumbry was 1-for-4 with a double and a walk for the IronBirds, while third baseman Levi Carolus added an RBI.
Aberdeen left-hander Jacob Smith didn't allow a run in four innings, collecting five strikeouts and issuing three walks.
Bluefield Orioles (Rookie)
Score: Princeton Rays 3, Bluefield Orioles 0 (Box score)
Recap: Starting pitcher Bobby Bundy (2-4) allowed three runs and five hits in five innings, and the Orioles were blanked, 3-0, by Princeton at Bowen Field.
Bluefield first baseman Corey Thomas and left fielder Lance West each contributed a double, while third baseman Mike Flacco was 0-for-3 with two strikeouts.
Orioles relief pitcher Chase Phillips struck out five batters, allowed one hit and issued three walks in two scoreless innings. The 22-year-old right-hander has a 0.64 ERA in 14 innings this season for Bluefield.
GCL Orioles (Rookie)
Score: GCL Red Sox 3, GCL Orioles 2 (Box score)
Recap: Shortstop Anyi Tejeda was 3-for-4 with two runs scored, but the Orioles fell, 3-2, against the Red Sox in the Gulf Coast League.
Orioles third baseman Moises Ciriaco added two hits and an RBI, and second baseman Anderson Childers contributed a double.
Starting pitcher Jario De La Cruz (2-2) gave up three runs and five hits in 6 2/3 innings for the Orioles. The 22-year-old right-hander collected five strikeouts and issued one walk.