Briefs: Serena loses cool, U.S. Open tuneup

TENNIS

Serena loses temper, match

Serena Williams lost her cool and her 19-match winning streak at the Western & Southern Open in Mason, Ohio, on Friday. Williams flubbed routine shots while falling to Angelique Kerber, 6-4, 6-4. She hadn't lost a set since she won the title match at Wimbledon.

After losing a game in the second set, she threw her racket at the ground, picked it up and slammed it on the court again.

"I probably need a break," she said after bowing out of the U.S. Open tuneup. "I'll be better in New York, I promise."

Older sister Venus reached the semifinals of a tournament for the first time this season by beating Samantha Stosur. She next faces Li Na. Petra Kvitova will face Kerber.

On the men's side, Novak Djokovic and Juan Martin del Potro won in straight sets, setting up a rematch of their bronze medal match at the Olympics, won by Del Potro. Top-ranked Roger Federer will face Stanislas Wawrinka.

GOLF

Walker shoots 62

Jimmy Walker shot an 8-under-par 62 to top the leader board at 12 under after two rounds of the PGA Tour's Wyndham Championship in Greensboro, N.C. Defending champion Webb Simpson (63) is a stroke back. Tim Herron shot a tournament-record 61, but is nine strokes back.

Langer on top

Bernhard Langer topped the Champions Tour leader board at 7 under after playing 15 holes when first-round play in the Dick's Sporting Goods Open was suspended because of rain at the par-72 En-Joie Golf Course in upstate Endicott.

COLLEGES

Mathieu in rehab

Former LSU player Tyrann Mathieu, 20, has entered a drug rehabilitation program in Houston. The star cornerback/punt returner was expected to be a main cog in the Tigers' national title hopes before being dismissed from the team.

-- APHofstra blanks Ohio State

Lulu Echeverry scored on a cross by Erin Havard in the 60th minute to give the Hofstra women's soccer team the lead in a 2-0 win over Ohio State in a non-conference season opener for both teams. Sam Scolarici added an unassisted goal with 18 minutes left. OSU made the Sweet 16 last year.

Adelphi will drop to Div. II

The Adelphi men's soccer team will drop from Division I in the 2013 season and join the rest of the university's Division II programs in the Northeast-10 Conference.