Defending champion

Rafael Nadal

gave his clay-court doldrums a boost by reaching the Madrid Open semifinals on Friday be defeating

Thomas Berdych

, 6-4, 6-2

In the women's tournament, two-time defending champion Serena Williams withdrew with a leg injury, while Maria Sharapova ousted Li Na in the quarterfinals.

The top-ranked Nadal had lost his previous two quarterfinal matches on clay for his worst run on the surface in a decade.

COLLEGES Trustees at Youngstown State University voted Friday to offer the president's job to former Ohio State football coach Jim Tressel, who started his college coaching career there. Tressel has been an administrator at the University of Akron for two years.

Tressel recently was a finalist for, but was not chosen to be, president at the University of Akron, where he is executive vice president for student success. He went to Akron after being forced out at Ohio State following a scandal in which players sold memorabilia for cash and tattoos, leading to an investigation that resulted in sanctions against the team and Tressel.

BOXING Heavyweights Bermane Stiverne and Chris Arreola weighed in ahead of Saturday night's 12-round bout for the vacant World Boxing Council title. Stiverne (23-1-1, 20 knockouts) measured 239.5 pounds, Arreola (36-3-0, 31 KOs) was 239.

The winner of the fight is slated to defend it this summer against Deontay Wilder (31-0, 31 KOs). The winner of that bout would be then expected to defend the title against North Philadelphia's Bryant Jennings, if Jennings (18-0, 10 KOs) gets past Mike Perez (20-0-1, 12 KOs) on May 24 in Corpus Christi, Texas.

SOCCER The Los Angeles Galaxy say defender Omar Gonzalez will be sidelined a week or two after injuring his left knee. Los Angeles coach Bruce Arena believes the defender will report on time to the U.S. national team's pre-World Cup training camp, which starts Wednesday.

HONOREES Steven Chadwin, Howard Eskin, Jules Love, Bobbie Rose, Michael Rose, Sara Schiffman, Steve Smoger, Leonard Tose, and Ed Rendell will be inducted into the Philadelphia Jewish Sports Hall of Fame on May 27 at 5:30 p.m. at Center City's Gershman Y.

- Staff and wire reports