Top seeds safely through to Sweet 16

WASHINGTON (Reuters) - Number one seeds Memphis Tigers and North Carolina Tar Heels recorded contrasting wins on Sunday to join top-ranked Kansas and UCLA in the Sweet 16 of the NCAA tournament.

While the top-seeded teams in each of the four regions followed the form book, the opening weekend of March Madness concluded with nail-biting finishes and upsets.

The Tar Heels, led by 20 points from Wayne Ellington, completed a weekend stroll through the East Regionals with a 108-77 win over the ninth seed Arkansas Razorbacks.

But in the South Region the Memphis Tigers were forced to fight off a gritty challenge form the eighth seed Mississippi State Bulldogs 77-74.

Derrick Rose and Chris Douglas-Roberts each contributed 17 points to the Memphis win as the Tigers clawed their way into the last 16 for the third consecutive year.

"You figure, we got them down 13, 14 (points) and they start going away but they (Mississippi) just come right back at us and never stop," Memphis coach John Calipari told reporters. "They just battled us."

Second seeds Texas Longhorns and Tennessee Volunteers also strained their supporters' nerves seats with cliff-hanging wins while the Midwest number two seed Georgetown Hoyas had their championship dreams crushed with a shock 74-70 loss to 10th- seeded Davidson.

STORY LINES

Davidson and 12th-seeded Western Kentucky Hilltoppers and Villanova Wildcats provided the surprise story lines of the opening rounds with their unlikely marches into the Sweet 16.