LONDON (AP) -- Michael Phelps ends his swimming career with another gold medal, helping the U.S. win the medley relay at the London Olympics.
It's his fourth of the Games, to go along with two silver.
Phelps leaves the sport with a record 18 golds and 22 medals overall.
Earlier in the pool, the U.S. set a world record while winning the women's medley relay.
Seventeen-year-old Missy Franklin swam the leadoff backstroke leg, Rebecca Soni (SOH'-nee) the breaststroke, Dana Vollmer competed in butterfly and Allison Schmitt had the anchor leg in freestyle.

TRACK AND FIELD
LONDON (AP) -- Shelly-Ann Fraser-Pryce made it back-to-back Olympic titles in the women's 100 meters, outleaning world champion Carmelita Jeter (JEH'-tur) of the U.S. by 0.03 seconds. The Jamaican is the first woman to repeat in the 100 since Gail Devers (DEE'-vurz) of the U.S. did it in 1992 and 1996.
Jessica Ennis (EH'-nihs) won the Olympic heptathlon gold medal. It's a first for Britain on the track.
American runner Sanya Richards-Ross won her semifinal heat in the women's 400 meters Saturday night, setting a blistering pace before coasting to a spot in the final.
Galen Rupp of the U.S. won a silver medal in the men's 10,000 meters. Somali-born training partner Mo Farah (FAYR'-uh) took gold.
All five of the top contenders won their opening heats in the men's 100. Defending champion Usain Bolt (yoo-SAYN'), Yohan Blake, Asafa Powell, Tyson Gay and 2004 Olympic champion Justin Gatlin moved on.
Also on the track Saturday, defending champion LaShawn Merritt of the U.S., who has been bothered by an injured left hamstring, pulled up in the backstretch of his 400-meter preliminary heat and limped slowly off the track.
And Oscar Pistorius (pihs-TOHR'-ee-uhs) of South Africa became the first amputee to compete on the track at an Olympics, finishing second in his 400-meter heat to advance. Pistorius is a double-amputee who runs on carbon-fiber blades.
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BASKETBALL
LONDON (AP) -- The U.S. men's basketball team survived its first true test of the 2012 Olympics, coming from behind in the fourth quarter to defeat Lithuania 99-94 in preliminary round play.
LeBron James took over late, scoring nine of his 20 points in the final four minutes to help the Americans remain unbeaten and avoid their first loss in Olympic competition since the 2004 semifinals in Athens. Carmelo Anthony tied for team scoring honors and Kevin Durant chipped in with 16 points.

TENNIS
Serena completes 'Golden Slam'
WIMBLEDON (AP) -- Serena Williams destroyed Russia's Maria Sharapova 6-love-6-1 at Wimbledon to win her first Olympic singles gold medal. She joins Steffi Graf as the only women with career Grand Slams and Olympic gold -- the so-called 'Golden Slam'.
Top-seed Victoria Azarenka (ah-zah-REN'-kuh) won bronze with a 6-3, 6-4 victory over Russia's Maria Kirilenko. It's the first tennis medal ever for Belarus.
American twins Bob and Mike Bryan claimed gold in men's doubles with a 6-4, 7-6 victory over Jo-Wilfried Tsonga (SAHNG'-guh) and Michael Llodra (loh-DRAH') of France.

BEACH VOLLEYBALL
American success in the sand
LONDON (AP) -- Two-time gold medalists Kerri Walsh Jennings and Misty May-Treanor (TRAY'-nur) beat the Netherlands in straight sets to advance to the quarterfinals of the Olympic beach volleyball tournament. The U.S. pair won gold medals in Athens and Beijing without losing a set. That streak was snapped on Wednesday in the final of the round-robin.
Also Saturday, Americans Jake Gibb and Sean Rosenthal beat Russia in straight sets to keep alive the U.S. hopes of a second consecutive men's gold. Defending champions Todd Rogers and Phil Dalhausser were eliminated in the round of 16 by Italy.

VOLLEYBALL
U.S. fails to seal the deal
LONDON (AP) -- The defending champion U.S. men's volleyball team failed to clinch the top seed in their pool, losing 3-2 to Russia after winning the first two sets. It snaps an 11-game Olympic winning streak. They have another chance Monday against winless Tunisia.

CYCLING
American cyclists settle for silver
LONDON (AP) -- Britain's women's pursuit team delivered the home nation its fourth Olympic gold medal in five events at the London Velodrome.
The three scorched across the finish line a quarter of a lap ahead of the silver medal-winning U.S. team.

RIFLE
Gray shoots her way to gold
LONDON (AP) -- Jamie Lynn Gray won the gold medal in women's 50-meter three-position rifle shooting, setting two Olympic records along the way. This is the second Olympics for Gray, who was fourth in air rifle and fifth in three-position rifle in 2008.

ROWING
Bronze for U.S.
WINDSOR, England (AP) -- Britain successfully defended its Olympic rowing title in the men's four by beating rival Australia to get the gold. The U.S. team finished third to secure the bronze medal.

MEDALS
U.S. locked in tight race with China
LONDON (AP)-- Midway through the London Games, the United States is locked in a tight battle with China in the medal competition. The U.S. leads by one medal on each list -- 26-25 in golds and 54-53 overall.
The U.S. has its swimmers to thank. Overall, U.S. swimmers have won 30 medals - including 16 gold.

IOC announces 2 more Olympic doping cases
LONDON (AP) -- The IOC says a Russian cyclist and Colombian track and field athlete have failed Olympic drug tests.
IOC spokesman Mark Adams says Russian track cyclist Victoria Baranova was expelled after failing a pre-competiton test. Her positive test had been confirmed Friday by cycling's governing body.
Baranova tested positive for testosterone July 24 in Belarus.
Adams says Colombian 400-meter runner Diego Palomeque has been provisionally suspended after a pre-competition positive test. The 18-year-old athlete did not start in his scheduled heat Saturday.

Moldova hammer thrower out of Olympics for doping
LONDON (AP) -- Hammer thrower Marina Marghieva of Moldova is out of the Olympics for doping.
The Moldovan Olympic Committee says it tossed her off the team after track and field's governing body said she failed a drug test.
The Olympic body says the 26-year-old Marghieva's backup sample will be tested to confirm a doping violation. The substance was not identified.
Marghieva was to have competed in a qualifying round Wednesday. Her 24-year-old sister, Zalina, also is entered in the hammer event. They are coached by their father, Soslan Marghiev.

INCHEON, South Korea (AP) -- Four South Korean badminton players have returned home after their disqualification from the Olympics for trying to lose matches.
The two women's doubles pairs arrived Saturday in Incheon International Airport and left through undesignated gates as they tried to avoid media. The athletes did not comment.
Two other doubles teams, from China and Indonesia, were also disqualified this week for deliberately playing poorly to secure a more favorable draw in the next round.
The International Olympic Committee is demanding further investigation by national Olympic committees. South Korea's Olympic delegation ordered the four players and their coach to return home, saying they violated the Olympic spirit of fair play and sportsmanship.