Although they are no longer conference companions, Maryland and Virginia remain unbreakable rivals in men’s soccer because of their common recruiting territory and bounty of championships.

Two years since they last met as Atlantic Coast Conference foes, they reunited Sunday night in the NCAA tournament. The margin was tight but the difference was wide: Maryland set the terms and did not relent, scoring late in the first half for a 1-0 victory over the defending national champions before 2,737 at Ludwig Field in chilly College Park.

Freshman attacker Eryk Williamson, a D.C. United youth academy graduate from Alexandria’s T.C. Williams High School, scored his fifth goal in five matches as the 10th-seeded Terrapins (11-5-5) advanced to face No. 7 Notre Dame (11-4-6) in the round of 16 next Sunday in South Bend, Ind.

Maryland, which lost in the 2013 final to the Fighting Irish, settled for a 0-0 draw with Notre Dame in this year’s season opener at the Indiana University tournament.

Featuring several freshmen, the Terrapins have found their form during a five-game unbeaten streak.

“We deserved the result,” Coach Sasho Cirovski said. “I was extremely proud of the way our players competed and also played some beautiful soccer.”

The Terrapins had a 23-8 advantage in shots and conceded few opportunities. Ignited by senior midfielder Tsubasa Endoh, Maryland’s high pressure and endless energy bedeviled the Cavaliers (10-5-3) and threatened to expand the lead before halftime. Aside from countering threats, Virginia labored to mount an attack.

“I give Maryland credit: I thought they deserved to win,” Cavaliers Coach George Gelnovatch said. “We just weren’t quite as good in handling the pressure and keeping the ball a little bit more and getting chances as I would like to have had.”

Maryland’s persistence was rewarded in the 38th minute when Mael Corboz’s free kick from 35 yards skipped through a crowd in the penalty area. Williamson was steps from the target and redirected the ball into the net.

After failing to score in his first 15 matches, Williamson recorded two goals in the regular season finale against Rutgers. And away he went. He struck in the Big Ten quarterfinals against Michigan, assisted in the semis at Indiana, then scored and assisted in the league final at Ohio State.

“They’ve pushed me all year,” Williamson said. “The guys have been good at practice, making sure I am tuned in so I replicate in the game. It’s been really working and obviously showing a little more.”

The Terrapins howled for a second goal in the 63rd minute when Ivan Magalhaes’s header off Endoh’s corner kick appeared to cross the line before goalkeeper Jeff Caldwell smothered it. However, none of the officials had a clear look at the sequence.

The Cavaliers’ pleas for a penalty kick in the 74th minute were ignored. They did not test junior goalkeeper Cody Niedermeier, who recorded his ninth shutout.

Maryland’s failure to finish several promising chances, though, left the outcome in the balance. Virginia’s Wesley Suggs preserved a one-goal margin by clearing Williamson’s header off the goal line in the 83rd minute.

The match ended with a harmless scuffle in the corner.

“We’re playing some of our best soccer right now,” Cirovski said. “The team has come together the way I thought it would.”

GEORGETOWN 3, HOFSTRA 0: Arun Basuljevic, Brandon Allen and Alex Muyl – all from the New York Red Bulls academy — scored against the Long Island visitors as the third-seeded Hoyas (16-2-2) stretched their winning streak to 14 and unbeaten mark to 17.

In the round of 16, Georgetown will host Boston College (11-7-1) at 1 p.m. Sunday. The Eagles upset No. 14 South Florida, 2-1, in extra time.

Basuljevic scored in the fifth minute. After a red card to Hofstra (14-8-0) in the 79th, Allen converted a penalty kick in the 87th to become the program’s all-time leader in goals with 50. With the Pride pushed forward, Muyl scored from near midfield with one second left.

“We had some golden opportunities to get the second goal, so that always leads to a little bit of tension,” Hoyas Coach Brian Wiese said. “Overall, we’re happy to be off and running in the tournament with a great result.”

VIRGINIA WOMEN 2, SOUTHERN CALIFORNIA 0: In Charlottesville, Makenzy Doniak and Alexis Shaffer scored as the Cavaliers (19-1-2) advanced to the quarterfinals against Rutgers (19-3-2) at 2 p.m. Friday at Klockner Stadium.

Virginia, one of four No. 1 seeds, is seeking a third consecutive berth in the College Cup. Rutgers, a No. 2 seed, advanced with a 4-0 victory over Connecticut.

Doniak scored in the 43rd minute and Shaffer struck in the 81st – the 14th goal of the season for each player. Morgan Stearns made six saves as Virginia recorded its 14th shutout victory.

In the other quarterfinals, Penn State will host West Virginia, Texas A&M will visit defending champion Florida State and Stanford will welcome Duke. The College Cup will take place Dec. 4 and 6 in Cary, N.C.