PHILADELPHIA, FEB. 1 -- Tonight, Georgetown University's basketball team made the wrong choice on whom to guard with its triangle-and-two defense. The Hoyas picked Doug West and Mark Plansky, and 7-foot-2 Tom Greis burned them for 21 points, leading Villanova to a 64-58 victory before 18,059 at the Spectrum.

Greis was eight of 10 from the floor and five of five from the line for Villanova (15-6, 7-3 in the Big East). But he played an equally inspired game on defense, blocking a career-high nine shots and altering several others.

"I think we realized {the triangle-and-two defense} immediately," Greis said. "The coaching staff yelled it out from the bench, and all we had to do was make the adjustment. It was not a really big deal."

He wasn't the only factor the Hoyas (14-5, 4-4) had to deal with. With unusually high humidity outside, and the huge crowd (the fifth largest ever to see a basketball game in Pennsylvania), the ice under the Spectrum floor started melting, producing condensation on the court that caused players to slip.

It was no excuse, however, as Villanova, which was coming off an 82-76 loss Saturday in Providence after blowing a 19-point second half lead, outplayed Georgetown. Plansky had 14 points for the Wildcats, and Gary Massey and Kenny Wilson each had 10.

Mark Tillmon led Georgetown with 24, tying his season high. Charles Smith had 15 but on six-for-23 shooting from the floor, three of 13 from three-point range. Overall, Georgetown shot 32.4 percent.

Villanova broke open a relatively close game late in the first half and early in the second, scoring the last eight points of the opening half and the first seven of the final half. When the 15-0 run ended, the Wildcats were up by 43-27.

Georgetown got within 56-52 late in the game with a tough comeback. But the Wildcats, shooting 72 percent from the line coming in, hit 19 of 24 foul shots, more than enough to maintain their lead.

The Hoyas came away impressed with sophomore Greis' improvement. He came into season averaging 3.9 points and 2.5 rebounds. This season, however, he is quicker around the basket and shoots better.

"He's improved a great deal," Georgetown's Perry McDonald said. "He's playing well right now. I was kind of surprised that he's playing that well. That's good for a big man that tall to still be playing well, making big contributions to their team."

"We were trying to key on Plansky and West," said Tillmon, who was the only Hoyas player anywhere near consistent (10 of 21) from the floor tonight. "Greis came out, we gave him the shot, and he hit the shot."

Guards Wilson and Massey penetrated and passed off in the lane to Greis for easy jumpers, or, if Georgetown packed in against the Wildcats' front court, took the shot themselves.

Georgetown was still ahead when Bobby Winston (six points) scored on a drive with 2:33 left in the half to put the Hoyas up, 27-26. But Greis scored on a 10-footer in the lane off Wilson's pass to put Villanova up with 2:05 to play. The Wildcats never trailed again.

Massey made three of four free throws, and Wilson a three-pointer from the right wing to give Villanova a seven-point halftime edge.

Villanova picked right up at the beginning of the second half. Massey scored on an alley-oop dunk from Wilson. At the other end, McDonald fought for two offensive rebounds, only to have Greis block the ensuing shots.

Massey got open underneath for another layin, and Greis scored again in the lane for a 13-point lead. Tillmon missed from deep in the left corner, and West didn't, throwing in a 22-footer for the 43-27 lead.

But midway through the half, Villanova went more than six minutes without a point. The Hoyas closed to 48-43 on Tillmon's jumper, but Greis' hook broke the drought.

"He makes big plays," said Villanova Coach Rollie Massimino, "he gets after it, and he just gets better everytime he steps onto the court."

Even when that court had some people suggesting that both teams try on cleats to deal with the slippery going.

"I was wondering if it was a Flyers game or a Villanova game," Greis said. "It was really slick out there."

Georgetown Coach John Thompson said both teams had to play on the slick surface, so neither team had a great advantage. Still, he wasn't happy.

"It's unfortunate to have to play with those conditions," he said, "but that had nothing to do with the outcome of the game. Villanova beat us."