RALEIGH, N.C. — Jason Richards' job as Davidson's point guard is to get the ball to star Stephen Curry — often.

On Sunday, Richards also had to practice some amateur psychology on his backcourt partner. With Curry missing shots and frustrated by Georgetown's vaunted defense, Richards tried to ease the tension during a timeout.

"If you're not going to have fun in the NCAA tournament, there's something wrong with you," Richards said. "We just kind of stayed relaxed, got him to smile finally, and I think that really got him going."

Did it ever. Curry scored 25 of his 30 points in the second half, and 10th-seeded Davidson rallied from a 17-point second-half deficit to stun No. 2 seed Georgetown 74-70 on Sunday, sending the Wildcats to an improbable spot in the round of 16.

Davidson (28-6), which hadn't won an NCAA tournament game in 39 years before Friday, will face No. 3 seed Wisconsin in the Midwest Regional in Detroit.

"I'm a dreamer, and I've been a dreamer my whole life," Wildcats coach Bob McKillop said. "For me to not think we could get to this moment, would be selling myself and the people who are behind me short."

Davidson did it behind the player the big schools thought was too short. Curry, the son of former NBA 3-point specialist Dell Curry, wanted to go to his father's alma mater. But neither Virginia Tech nor any other major school offered the slight Curry a scholarship.

He's since grown four inches to 6-foot-3, and his second-half performance Sunday helped put Davidson in a spot it hasn't been since Lefty Driesell led the school of 1,700 students to two regional finals in the 1960s.

"For the most part, he had guys all over him and the ball was going in," Georgetown coach John Thompson III said.

Jessie Sapp scored 14 points and Jonathan Wallace had 12 in a stunning collapse for Georgetown (28-6), which saw the college careers of Wallace and 7-foot-2 Roy Hibbert end under the weight of 20 turnovers and Curry's brilliance.

"I have confidence to shoot the ball every time I shoot it," said Curry, who missed 10 of his first 12 shots. "In the open court, that's my game — get my feet set and knock down shots. ... When I start getting my shot going, it does feel good."

Despite playing in front of a supportive crowd 160 miles from its campus just north of Charlotte, Davidson appeared finished when Georgetown was shooting 71 percent from the field early in the second half. The Hoyas had stifled Curry and appeared in command of their quest to make the Final Four for the second straight year.

But, like on Friday when he scored 30 of his 40 points in the second half of Davidson's comeback win over Gonzaga in the first round, Curry took over.

He hit six of his last nine shots, then hit five of six free throws in the final 23 seconds.

Curry started rolling during Davidson's 16-2 run. He converted a four-point play, buried a 3-pointer from the right wing and fed Andrew Lovedale for a layup to cut Georgetown's lead to 50-48 with 8:47 left.

Even Georgetown, which was giving up only 57.6 points a game coming in, couldn't stop him now. Showing his lightning-quick release, Curry drilled a 3, then had a three-point play with 4:40 left that put Davidson ahead 60-58, its first lead since 2-0.

After picking up his fourth foul, Curry scored on a nifty scoop shot in the lane and hit another deep 3 to make it 65-60 Davidson with 2:56 left.

The Hoyas' comeback bid was foiled by Curry's free-throw shooting, allowing Davidson to extend the nation's longest winning streak to 24.

Villanova 84, Siena 72

At Tampa, Fla., Scottie Reynolds scored 25 points and Corey Stokes added 20 as the 12th-seeded Wildcats beat tiny Siena to reach the round of 16 for the third time in four years.

Villanova (22-12), one of the last teams picked for the tournament field, advanced to play top-seeded Kansas (33-3) in the regional semifinals.

South Regional Texas 75, Miami 72 North Little Rock, Ark.

A.J. Abrams calmly sank two free throws with 9.5 seconds remaining, giving the second-seeded Longhorns just enough margin to hold off Miami.

Abrams gave Texas a 74-69 lead, but the Longhorns weren't quite safe yet. Miami's Raymond Hicks made a 3-pointer, and D.J. Augustin then shot an air ball on his first of two free throws with 1.8 seconds to play. Augustin made the second, though, to preserve the win.

Abrams scored 26 points on six 3-pointers for the second consecutive game. Texas (30-6) advances to the regional semifinals to play third-seeded Stanford on Friday in Houston.

Jack McClinton scored 18 points for Miami (23-11).

Memphis 77, Mississippi State 74

Joey Dorsey had 13 points, 12 rebounds, a season-high six blocks and an untold number of bumps and bruises, helping Memphis wins its ninth straight and advance to the round of 16 for the third straight year.

Derrick Rose and Chris Douglas-Roberts added 17 points each for the Tigers (35-1), who will play fifth-seeded Michigan State (27-8) in the regional semifinals on Friday.

Jamont Gordon had 21 points and Ben Hansbrough 19 for eighth-seeded Mississippi State (23-11), which hasn't made it out of the first weekend since the 1996 team went to the Final Four.

East Regional Louisville 78, Oklahoma 48 Birmingham, Ala.

Earl Clark scored 14 points and Louisville handed Oklahoma its most-lopsided loss in the NCAA tournament, building a 44-22 halftime lead and coasting from there.

Louisville matched its biggest rout in the NCAA tournament, having trounced Kansas State by 30 in 1968. Starting five players born outside Kentucky, the third-seeded Cardinals (26-8) reached the round of 16 for the first time since 2005. They will take on Tennessee, which beat Butler 76-71 in overtime, on Thursday night in Charlotte, N.C.

David Godbold hit four 3s and finished with 15 points for sixth-seeded Oklahoma (23-12). Star freshman Blake Griffin was held without a shot for 12 minutes and had eight points.

Tennessee 76, Butler 71

JaJuan Smith hit four straight free throws in the final 13.6 seconds of overtime and the Volunteers survived a game they nearly turned into a rout.

The Vols (31-4) scored six straight points inside after the Bulldogs took their first lead in the final 2 minutes of OT, including benched guard Ramar Smith's basket with 27 seconds left to make it 72-68. That after Tennessee led by 13 early in the game.

A.J. Graves led Butler (30-4) with 21 points on just 6-of-18 shooting. Mike Green added 15 points, seven rebounds and five assists before fouling out late in overtime.

North Carolina 108, Arkansas 77

At Raleigh, N.C., Wayne Ellington scored 20 points, Ty Lawson had 19 points and seven assists and the Tar Heels raced to a double-digit lead in the first 5 minutes of the blowout.

North Carolina (34-2) will face fourth-seeded Washington State on Thursday night in Charlotte, the same arena where they won the Atlantic Coast Conference tournament last weekend.

West Regional Western Kentucky 72, San Diego 63

At Tampa, Fla., Behind Courtney Lee's dazzling first-half performance and some clutch shooting down the stretch, the 12th-seeded Hilltoppers advanced to the round of 16 for the first time in 15 years and have a date with top-seeded UCLA in Phoenix.

Lee finished with 29 points, including a huge 3-pointer that gave his team the lead for good with 6:17 remaining. Six straight free throws in the final 34 seconds sealed the victory for the Hilltoppers (29-6).

Gyno Pomare had 20 points and nine rebounds for the Toreros (22-14), who overcame a 15-point deficit in the second half before fading in the closing minutes.