H. Rumph Jr , Associated Press
Harvard's Oliver McNally, left and Penn's Henry Brooks chase a loose ball in the first half of an NCAA college basketball game Friday, Feb. 10, 2012, in Philadelphia.

PHILADELPHIA — Corbin Mille and Kyle Casey scored 17 points apiece and No. 25 Harvard remained perfect in the Ivy League with a 56-50 win over Penn on Friday night.

The Crimson (21-2, 7-0) snapped a tie game midway through the second half with an 11-2 run that gave them the needed cushion to hang on for their ninth straight win.

Zack Rosen kept the Quakers (12-11, 4-2) in the game with a 3-pointer well above the top of the arc that cut it to 53-50 with 23.7 seconds left. The Crimson hung on from the free-throw line and beat Penn for the sixth straight time.

Rosen scored 16 points and Miles Cartwright had 12 for Penn, which has lost two of three to drop out of contention in the conference.

Penn's student section made a sign that read "Not Even Jeremy Could Help You Tonight."

Harvard could have used former star and current New York Knicks sensation Jeremy Lin against the pesky Quakers. Lin did just about everything at Harvard except lead the Crimson into the NCAA tournament. This could be the season coach Tommy Amaker takes them there.

There is no conference tournament for the Ivy. Harvard looks to keep its unbeaten conference season alive Saturday at Princeton.

The Crimson nearly let this get away in the final minutes. Rosen forced a turnover that led to Rob Belcore's layup that made it 51-47. Rosen followed with the way-long 3, after a rushed shot two possessions earlier knocked the bottom of the net.

Harvard sealed it from the line.

It was ugly for both teams. Penn shot 30 percent (8 of 27) in the first half and Harvard only 32 percent (8 of 25). The Quakers missed 17 of 22 3-pointers and the Crimson missed 15 of 19.

Harvard got hot when it mattered most in the second half. Miller put Harvard ahead 33-30 on a 3-pointer and hit a second 3 for a 10-point lead. The Crimson had the composure and the poise to maintain the lead even as the Quakers charged hard down the half in front of a large and loud crowd at the Palestra.