Osaka’s knee injury brings uncertainty to the U.S. Open

MASON, OHIO >> Naomi Osaka felt a strange sensation in her left knee, different than anything she’d experienced. The U.S. Open champion left the court worried about whether she’ll be in shape to defend her precious title.

Osaka retired from her quarterfinal match at the Western & Southern Open on Friday, unsure what’s going on in the knee. She expected to get an MRI.

For now, the player currently ranked No. 1 in the world is concerned about her chances of making another deep run in New York.

“Last year, I won the U.S. Open,” she said. “This year, I’m trying to play the U.S. Open.” The problem came out of the blue. Osaka split two sets with Sofia Kenin. She felt something unusual in the knee while serving early in the third set. After a timeout to have it examined and wrapped, she played a couple more points before retiring.

“I have no idea what’s going on,” she said.

With that, Kenin advanced to the semifinals for the second straight week. She’ll face Madison Keys, who beat Venus Williams 6-2, 6-3 to reach the semifinals for the first time.

Rockets’ Tucker withdraws from USA Basketball camp

ANAHEIM , CALIF.>> Houston forward P.J. Tucker has withdrawn from consideration for USA Basketball’s World Cup roster, meaning 14 players remain in consideration for 12 spots.

Tucker withdrew Friday, citing a minor left ankle issue. He has twisted the ankle twice in the last several days and decided the best move would be to let it fully heal before going to training camp with the Rockets next month.

The 34-year-old Tucker was the oldest player left in World Cup camp with the Americans. He had three points and three rebounds in the team’s intrasquad scrimmage at Las Vegas on Aug. 9.

Reports: McGregor questioned by police after bar punch

DUBLIN >> Retired mixed martial arts fighter Conor McGregor apparently punched a man in a pub back in April, and Irish police reportedly are investigating.

TMZ acquired video of the attack and published it Thursday. The security camera footage appears to show McGregor hitting an older man in the face after he refused a shot of McGregor’s Proper Twelve whiskey brand.

McGregor was quickly removed from the bar by friends. Several Irish media outlets reported police have questioned McGregor about his latest misbehavior outside the cage.

Jimenez, Barron share lead

ENDICOTT, N.Y. >> Miguel Angel Jimenez birdied three of the final six holes Friday for a 7-under 65 and a share of the first-round lead with Monday qualifier Doug Barron in the PGA Tour Champions’ Dick’s Sporting Goods Open.

Jimenez had eight birdies and a bogey at En Joie Golf Club. The 55-year-old Spaniard won the Chubb Classic in February in Florida for his seventh senior title.

The 50-year-old Barron had seven birdies in a bogey-free round. He’s coming off a fifth-place tie in the Senior British Open in his Champions debut.

Teen Trolio advances to U.S. Amateur semifinals

PINEHURST, N.C. >> Teenager Cohen Trolio advanced to the U.S. Amateur semifinals by beating Austin Squires 3 and 1 on Friday.

The 17-year-old rising high school junior from West Point, Mississippi, won the final three holes of the match — Nos. 15-17 at Pinehurst No. 2 — to end Squires’ unlikely run.

Squires claimed the 64th seed and last spot in the match-play field on the fourth hole of a 27-for-3 playoff.