Morning Roundup: Serena withdraws, Osaka loses, Federer wins at Miami

The new site for the Miami Open suddenly is missing a lot of star power.

Serena Williams withdrew Saturday, blaming a previously undisclosed left knee injury. Less than two hours later, top-ranked Naomi Osaka lost in the third round to tour veteran Hsieh Su-Wei of Taiwan, 4-6, 7-6 (4), 6-3.

Roger Federer briefly seemed headed for the exit but instead advanced to the third round by rallying past qualifier Radu Albot 4-6, 7-5, 6-3.

Williams' withdrawal was unexpected because she showed no signs of injury a day earlier while winning her opening match against Rebecca Peterson, 6-3, 1-6, 6-1.

Williams' victory Friday was her first at Hard Rock Stadium, the Miami Dolphins' home and the Miami Open's new center court. The tournament moved this year from Key Biscayne, where Williams won eight titles.

Cowgirls win golf tourney in Hawaii

The Oklahoma State women's golf team won the Anuenue Spring Break Classic by 26 strokes Saturday in Waikoloa, Hawaii.

The Cowgirls, who shot their best round of the season Saturday with a 285 (-3), had an overall score of 885 (+21). Arkansas State took second place.

OSU's Han-Hsuan Yu finished second in the individual standings at 1-over 217, one shot behind Utah Valley's Kaylee Shimizu.

Patriots owner apologizes in Florida prostitution case

New England Patriots owner Robert Kraft is apologizing after being charged in a Florida massage parlor prostitution investigation.

"I am truly sorry," Kraft said in a statement Saturday. "I know I have hurt and disappointed my family, my close friends, my co-workers, our fans and many others who rightfully hold me to a higher standard."

Kraft said he has "extraordinary respect for women," adding that his morals were shaped by his late wife. Myra Kraft died in 2011.

Late Friday: Virginia Tech beats Saint Louis 66-52

Nickeil Alexander-Walker scored 20 points, Kerry Blackshear added 15 and the fourth-seeded Virginia Tech men's basketball team earned its first NCAA Tournament win in 12 years by beating No. 13 seed Saint Louis 66-52 on Friday night in San Jose, California.

Coach Travis Ford fell to 1-7 all-time in the NCAA Tournament. He lost the opener in his only trip with Eastern Kentucky in 2005 and then again in his final four trips with Oklahoma State. His only win came in the first round against Tennessee in 2009 before losing to Pittsburgh.

Staff and wire reports