In brief: Azarenka collapses at U.S. Open

Tennis: The scene was simply scary: Victoria Azarenka, a 21-year-old on the rise in the WTA rankings, paused about a half-hour into her second-round match Wednesday at the U.S. Open in Flushing, N.Y., then staggered, stumbled and collapsed to the court.

Azarenka rolled over to rest her head on her arm, and a trainer rushed over. She eventually was helped into a wheelchair and taken to a hospital, where tests showed she had a mild concussion.

Azarenka later revealed she fell in the gym while warming up before the match, banging her head and arm in the gym.

Azarenka’s match against Gisela Dulko of Argentina was halted with Dulko leading 5-1 in the first set.

It was by far the most stunning developing on Day 3 of a tournament that produced some surprising results on the scoreboard, including 18-year-old American qualifier Ryan Harrison’s victory over 15th-seeded Ivan Ljubicic, and unseeded Michael Llodra’s upset of Wimbledon runner-up Tomas Berdych.

Winners included No. 4-seeded Andy Murray, No. 12 Mikhail Youzhny, No. 14 Nicolas Almagro, No. 18 John Isner, and No. 20 Sam Querrey, who beat NCAA singles champion Bradley Klahn of Stanford 6-3, 4-6, 7-5, 6-4 in an all-American matchup.

At night, defending champion Kim Clijsters reached the third round by beating 201st-ranked qualifier Sally Peers of Australia 6-2, 6-1.

They were followed onto the court at Arthur Ashe Stadium by 2003 U.S. Open champion Andy Roddick, who was upset in four sets by Janko Tipsarevic, 3-6, 7-5, 6-3, 7-6 (4).

Venus Williams struggled for a bit against 193rd-ranked qualifier Rebecca Marino of Canada before pulling out a 7-6 (3), 6-3 win.

U.S. beats Iran, stays unbeaten at Worlds

Basketball: The United States eased its way to a top seed in the knockout round of the world championship, beating Iran at Istanbul, Turkey, 88-51.

Kevin Love scored 13 points and Kevin Durant 12 for the Americans (4-0), who will meet the fourth-place team from Group A in the round of 16.

• Pondexter, Liberty eliminate Fever: At New York, Cappie Pondexter scored 30 points, including a tiebreaking jumper with 28 seconds remaining, and led the New York Liberty to a 77-74 victory over the Indiana Fever to advance to the Eastern Conference finals.

Indiana’s Briann January (Lewis and Clark) scored six points to go along with a rebound and a steal.

The Liberty will face Atlanta in the East finals beginning Sunday night at Madison Square Garden.

Sounders advance to U.S. Open Cup final

Soccer: Nate Jaqua scored twice, Fredy Montero added a goal and the defending U.S. Open Cup champion Seattle Sounders advanced to the title game with a 3-1 victory over Chivas USA at Tukwila, Wash.

Jaqua scored in the 10th minute and again in second-half stoppage time, and Montero connected in the 58th minute. Jaqua has five goals in Seattle’s three Open Cup games.

The Sounders will face the Columbus Crew in the title game Oct. 5 at Qwest Field. Last year in the final, the Sounders beat United 2-1.

• Crew top United in other U.S. Open Cup semi: Guillermo Barros Schelotto scored a 98th-minute penalty kick and the Columbus Crew reached their first U.S. Open Cup final since 2002 with a 2-1 overtime semifinal victory over short-handed D.C. United in Washington.

Fana takes IBF junior lightweight title

Boxing: Mzonke Fana won a vacant junior lightweight title with an easy unanimous decision over fellow South African Cassius Baloyi at Brakpan, South Africa.

The 36-year-old Fana regained the IBF version of the title he lost to Baloyi in April 2008. The belt had been vacated by Robert Guerrero when he couldn’t defend it against Fana in February.

• Son of boxing promoter Arum missing in Cascades: Nearly two dozen mountaineers and park rangers are searching for the son of Hall of Fame boxing promoter Bob Arum, who’s been missing since a weekend camping trip in the Cascade Mountains.

John Arum was expected to arrive home Sunday after climbing Storm King, a rugged peak about a seven-hour drive from Seattle. Family members grew worried when the 49-year-old environmental lawyer and accomplished hiker did not return.

American sprinter Gay wins Zagreb 100

Miscellany: American Tyson Gay beat Jamaican rival Nesta Carter in the 100 meters in the Zagreb World Challenge at Zagreb, Croatia, finishing in 9.92 seconds after the two briefly touched hands during the race. Carter was second in 10.07.

In other events, American Dwight Phillips won the long jump at 25 feet, 9 1/4 inches, and countryman Nick Symmonds took the 800 in 1:45.37.

Americans Justin Gaymon, Lolo Jones and Marshevet Myers also won. Gaymon took the 400 hurdles in 49.19, Jones won the women’s 100 hurdles in 12.87, and Myers topped the women’s 200 field in 22.94.

• Farrar wins 5th stage of Spanish Vuelta: Tyler Farrar of the United States won the fifth stage of the Spanish Vuelta at Lorca, Spain, and Philippe Gilbert of Belgium maintained the overall lead.

Farrar capped the 123.5-mile stage from Guadix to Lorca by crossing the finish line ahead of Koldo Fernandez of Spain and Mark Cavendish of Britain.

• Montana picks up former Washington TE Middleton: A tight end who was dismissed from the University of Washington for a violation of team rules has joined the University of Montana football team.

Kavario Middleton was dismissed from Washington in July for what the Seattle Times reported was a failed drug test.