GREENSBORO, North Carolina (Ticker) -- North Carolina carried over the momentum of its emotional win over Duke with another upset.
Jawad Willliams scored a career-high 25 points and freshman Ray Felton added 20 points and 10 assists to lead the Tar Heels to an 84-72 upset of 15th-ranked Maryland in the Atlantic Coast Conference Tournament quarterfinals.
Last Sunday, North Carolina (17-14) closed its regular season with an 82-79 victory over Duke. Although that win completed just a 6-10 league record, the Tar Heels served notice that they were ready for the ACC Tournament.
"I think there's no question that Sunday's win over Duke gave us the confidence we needed," North Carolina coach Matt Doherty said.
Maryland (19-9), the second seed, swept the season series from North Carolina, including a 96-56 rout on February 22 - the worst ACC loss in school history for the Tar Heels.
"Having lost to (Maryland) by 40 points and to win by 12...I don't know if that is some kind of record in terms of a loss to a win, but it's got to be something," Doherty said. "I don't think nybody gave us a chance here."
But Friday was a different story, thanks to North Carolina's 3-point shooting. The Tar Heels were 11-of-23 from beyond the arc, including 5-of-7 by Melvin Scott, who finished with a career-high 19 points. Maryland, the conference's best 3-point shooting team, was 6-of-19 from beyond the arc.
"Melvin gave us a big lift with his shooting," Doherty said.
Felton and Scott each hit a pair of 3-pointers to highlight a 16-5 run, giving North Carolina a 66-55 lead with 7:30 left.
Maryland pulled within 78-72 after a four-point play by Steve Blake with 1:15 left, but did not score the rest of the way.
The Tar Heels will play Duke in Saturday's all-North Carolina semifinals. In the other semifinal, Wake Forest takes on North Carolina State.
Despite the loss, Maryland is a lock for an at-large bid to the NCAA Tournament. The Terps won the national last championship last season and advanced to the Elite Eight two years ago, but have not won the ACC Tournament since 1984.
"I'm still proud of this team for finishing with the second seed in the ACC," Maryland coach Gary Williams said. "We won the games when we had to in order to get into the NCAA Tournament. I'm proud of that after losing four starters from last year."
Drew Nicholas led Maryland with 18 points, but just three of those came in the second half, and Blake added 12 points and 10 assists.
"Before the game I really thought we had a pretty good mindset," Nicholas said. "It was really another situation where we didn't show enough emotion or enough passion to play in this kind of atmosphere."
The Terps hurt North Carolina with their size and inside play in the season sweep, but their front line was not a factor on Friday. Tahj Holden, Ryan Randle and freshman Nik-Caner Medley combined for just 16 points, nine less than the 6-8 Williams scored for the Tar Heels.
"We went out and fought hard tonight," Williams said. "Down low it was a challenge for me and my fellow post players. We went out and fought every possession. We gave great effort."
Freshman Rashad McCants had 12 points and 11 rebounds and center David Noel added eight points and rebounds for North Carolina.
Tar Heels guard Jackie Manuel suffered a strained right arch four minutes into the game and did not return. He is questionable for Saturday.
Maryland held a 48-43 lead with 12:46 left, but North Carolina scored seven straight points to start a 23-7 run over the next 5:16. Scott ignited it with a 3-pointer and McCants followed with a dunk and a pair of free throws to give North Carolina the lead for good.
After another 3-pointer by Scott increased the advantage to 56-52 with 9:56 left, freshman John Gilchrist completed a three-point play for Maryland.
But the Tar Heels scored the next 10 points as Scott and Felton each hit 3-pointers to give North Carolina a 66-55 advantage.
Nichols scored 15 points in the first half on 6-of-10 shooting when Maryland built a 40-36 lead.