The Atlantic Coast Conference waited until Sunday to take over the Final Four.

Duke beat Xavier, 66-63, to end the Musketeers’ surprising NCAA Tournament run, and short-handed Georgia Tech beat Kansas University, 79-71 in overtime, in the last two regional finals.

This will be the sixth straight season one conference has half of the national semifinalists. The ACC also did it in 2001, the last time Duke was in the Final Four when the Blue Devils won their third national title.

Duke, the only No. 1 seed to make it, will play Connecticut on Saturday in San Antonio, while Georgia Tech faces Oklahoma State.

This is the ninth time since seeding began in 1979 that only one No. 1 made it. Connecticut and Oklahoma State were No. 2 seeds, while the Yellow Jackets were a 3.

Xavier gave it quite a run at becoming just the second No. 7 seed to make it — Virginia did in 1984 — but Blue Devils freshman Luol Deng came up with two huge offensive rebounds in the final three minutes, and coach Mike Krzyzewski improved to 10-1 in regional finals since 1986.

The Musketeers had knocked off Louisville, second-seeded Mississippi State and No. 3 Texas with a potent three-point attack anchored by senior guards Lionel Chalmers and Romain Sato. Xavier was 30-for-62 from beyond the arc in the tournament until going 3-for-15 against Duke.

Connecticut, making its first Final Four appearance since 1999 and second ever, spent eight weeks as No. 1 this season, and Duke was on top of the poll for four weeks. That matchup will feature two of the best defensive teams in the country, both on the perimeter and inside, and both are balanced offensively. The screaming already has started that this should be the championship game.

Georgia Tech and Oklahoma State, in the Final Four for the first time since 1995, will be a meeting of two strong backcourts, although the Yellow Jackets have to wait and see how far leading scorer B.J. Elder comes along from a sprained ankle.

Jarrett Jack led Georgia Tech into the Final Four for the first time since 1990.

Jack, a 6-foot-3 sophomore who came into the game averaging 12.2 points, had a career-high 29 points, nine rebounds and six assists.

Jack was 8-for-12 from the field, and his driving and dishing helped set up a number of open shots for his teammates, none bigger than Will Bynum’s three-pointer with 1:48 left that gave Georgia Tech the lead for good at 74-71. Jack had eight points in the five-minute overtime.

It was another close game for the Yellow Jackets, who won their first three in the tournament by an average of 4.3 points. The Jayhawks had cruised to the regional final with no game closer than 15 points and two wins by 25 or more.

It was more than just Jack for Georgia Tech as center Luke Schenscher had 15 points and reserve forward Clarence Moore added 14.

Oklahoma State’s backcourt of John Lucas and Tony Allen will have an advantage if Elder isn’t 100 percent, but the way Jack stepped up, it might not be that big.

Sunday was just the second overtime game of the tournament.

DePaul beat Dayton, 76-69, in double-overtime in the opening round. The last regional final to go overtime was Arizona’s 96-92 victory over Providence in 1997. The Wildcats went on to win it all.