(1) North Carolina 108, (9) Arkansas 77: Y'know, I'm beginning to think the Tar Heels are serious about winning this thing.

Want an indication of how dominant Carolina has been thus far? Mike Copeland -- the 15th man on the North Carolina bench -- has played in both games.

For the second game running, Carolina put the game out of reach early, topping the 100-point mark again and emptying the bench to give the regulars a little time to savor a win. Wayne Ellington led the Heels with 20 points, Ty Lawson had 19 and seven assists and Tyler Hansbrough posted his usual double-double, with 17 points and 10 boards.

Carolina became the first team since Loyola Marymount in 1990 to post 100-plus points in each of its first two NCAA Tournament games.

(1) Memphis 77, (8) Mississippi State 74: Everyone knows the Memphis Tigers can run you to death. But what happens if you slow 'em down, beat 'em up, and get 'em involved in a physical halfcourt game?

They still win.

The physical style suited Memphis' Joey Dorsey, who contributed 13 points 12 boards, six blocks and five fouls to the cause. Chris Douglas-Roberts and Derrick Rose tied for the team lead in scoring with 17.

The Bulldogs had a shot to tie it at the buzzer, but Jamont Gordon's three-point attempt wasn't close.

(2) Tennessee 76, (7) Butler 71 (OT): Some coaches might consider the second round of the NCAA Tournament an odd time to change the starting lineup. Not Bruce Pearl. His Volunteers hadn't been terribly impressive of late -- taking an early loss in the SEC Tournament, struggling to finish off American University in the first round. So for their second-round matchup with Butler, he replaced point guard Ramar Smith with J.P. Prince. The result? A win -- but once again, the Vols cut things close, needing an extra period to finish off the seventh-seeded Bulldogs.

It will be interesting to see if Pearl sticks with the new lineup. Prince was a bit shaky at times in his first start as a Vol -- he scored nine points, with seven boards and five assists in 31 minutes, but committed six turnovers. Smith played 18 minutes, scoring eight points with one assist and two miscues.

(2) Texas 75, (7) Miami (FL) 72: The Longhorns thought they'd closed out another win and were headed to the Sweet Sixteen. Only problem was, there were still five minutes left to play, and the Miami Hurricanes weren't quite ready to end their season. The 'Canes staged a furious comeback from a sixteen-point deficit and really made the second-seeded Longhorns sweat at the end; Miami's final inbounds pass was broken up, preventing a three-point attempt that might have tied the game.

A.J. Abrams led Texas with 26, and hit two key free-throws with 9.5 seconds remaining in the contest.

(3) Louisville 78 , (6) Oklahoma 48: This game had a nice symmetry to it. It was Louisville's biggest NCAA Tournament win ever -- and Oklahoma's biggest loss.

The Cardinals delivered on a prototype Rick Pitino basketball game: aggressive defense, lots of running, lots of fast breaks, and lots and lots of easy baskets. The power game that freshman forward Blake Griffin used so effectively against St. Joseph's in the opening round was no help against Louisville's physically-imposing front line; Griffin was held to just eight points.

(12) Villanova 84, (13) Siena 72: Villanova was one of the last teams to make the NCAA Tournament. Now they're one of the last sixteen teams standing.

The Wildcats were far from a sure thing to reach March Madness. A win over Syracuse in the Big East tournament probably put Jay Wright's club over the top -- and sent Jim Boeheim's to the NIT.

But they're like bad houseguests, these Wildcats. Once they get in the door, it's hell to get 'em to leave. They're in the Sweet Sixteen now for the third time in four years.

Excellent guard play can take you a long way in the NCAA Tournament, and excellent guard play is Villanova's trademark. Scottie Reynolds -- who might be the biggest star of this tournament were it not for Stephen Curry's heroics for Davidson -- led 'Nova in points (25) boards (8) and assists (5).

(12) Western Kentucky 72, (13) San Diego 63: Like Villanova, the Hilltoppers of Western Kentucky advanced to the Sweet Sixteen on the strength of excellent guard play. The Hilltoppers' trio of senior guards -- Courtney Lee, Tyrone Brazelton and Ty Rogers -- combined for 49 of WKU's 72 points, with Sun Belt Conference player of the year Lee scoring 27, grabbing seven rebounds and hitting six straight free throws in the final minute to seal the win.