WATCH LIVE: Day 15 of the Olympics

TRACK AND FIELD

Fresh off winning the 10 kilometer race in dramatic fashion , British standout Mo Farah is looking for his second double when the 5K sets off at 7:30 p.m. Farah won the 5K and 10K in London four years ago.

South Africa's Caster Semenya has dominated the 800 meters this year and is a favorite to win the gold medal at 7:15 p.m. She kept plenty in reserve in the semifinals and still easily posted the fastest time. The silver medalist in London four years ago, Semenya has become the unwilling face of the controversial debate in track and field over women with very high levels of testosterone being allowed to compete.

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The women's 4x400 relay is at 8 p.m. The Americans made it look easy in their heat Friday night, winning by more than 3 seconds over second-place Ukraine. Courtney Okolo ran the first leg, followed by Taylor Ellis-Watson, Francena McCorory and Phyllis Francis.

Jamaica, the U.S. and Belgium had the top qualifying times on Friday night for the men's 4x400 finals, which are being run at 8:35 p.m.

Defending javelin champion Keshorn Walcott set the tone for the 8:55 p.m. final by leading qualifying. The Trinidad and Tobago thrower produced one of the surprises of the London Games four years ago when he won the Olympic title only weeks after winning the under-20 world title. World champion Julius Yego of Kenya didn't get a qualifying mark until his third throw in the preliminaries.

In the 1,500, Kenyans Asbel Kiprop and Ronald Kwemoi are good shots for medals at 7 p.m. Algerian Taoufik Makhloufi and American Matt Centrowitz hope to crash the party.

American Chaunte Lowe is searching for her first medal in the high jump at her fourth Olympics and has the top jump of the season. Marie-Laurence Jungfleisch of Germany should also be in the mix. And keep an eye on teenager Vashti Cunningham, who's the daughter of longtime NFL quarterback Randall Cunningham .

SOCCER

Brazil takes on Germany for the men's gold at 3:30 p.m. in a rematch of nations that made it to the World Cup semifinals. The players are different in this under-23 game, but Brazilians are hungering for redemption after the humiliating 7-1 loss at home.

As Brazil routed Honduras in the Olympic semifinals, the crowd chanted that Germany's "turn is coming up."

Victory would give Brazil, led by standout Neymar after a disappointing start to the tournament, the only trophy it hasn't won in soccer.

Honduras plays Nigeria for the bronze at 11 a.m.

BASKETBALL

The U.S. women take on Spain at 1:30 p.m. seeking an unprecedented sixth consecutive Olympic gold medal. Spain, meanwhile, has assured itself of the first medal in women's basketball in the country's history.

The two teams met in the preliminary pool and the Americans won by 40 points. They did have a healthy Sue Bird for that game. She missed the semifinal win over France because of a sprained right knee capsule but practiced on Friday and said she hopes to play.

The Americans won their first seven games by an average of nearly 40 points and are scoring 102.3 points a contest.

France faces Serbia in the bronze medal game at 9:30 a.m.

BOXING

The two most successful nations in Olympic boxing will meet with a gold medal on the line for the first time in 20 years. Standout U.S. bantamweight Shakur Stevenson and defending Olympicchamp Cuba 's Robeisy Ramirez will end that drought at 12:15 p.m. in a fight that could resonate through boxing for years.

British flyweight Nicola Adams also fights for her second straight gold medal against France's Sarah Ourahmoune, and Cuban star Arlen Lopez faces Uzbekistan's Bektemir Melikuziev for middleweight gold.

GOLF

Inbee Park takes a two-shot lead into the final round of women's golf at Olympic Golf Course.

Kiwi Lydia Ko, the No. 1 player in women's golf, is on her heels. She made the first hole-in-one of her career as she raced into contention. Gerina Piller, an American who has not won on the LPGA tour (but perhaps best known for a clutch putt in the 2015 Solheim Cup), is also two shots back.

VOLLEYBALL

Serbia will face a young Chinese squad led by former U.S. coach Jenny Lang Ping in the women's finals at 8:15 p.m. The Chinese upset defending Olympic champion Brazil in the quarterfinals and beat the Netherlands in four sets in the semis.

Serbia, which will get the country's first volleyball medal, advanced to the finals by beating the U.S., which plays the Dutch for the bronze at 11 a.m.

WATER POLO

Defending Olympic champion Croatia plays Serbia at 3:50 p.m. for the gold.

Serbia was a heavy favorite coming into the tournament, but the world champions played to a draw in each of their first two games and then lost 6-5 to Brazil. They recovered with four straight victories.

DIVING

China seeks its seventh diving gold of the Rio Olympics as 10-meter men's platform finals get underway at 2:30 p.m. One more would allow the Chinese to match their total from 2008 in Beijing, when they won 7 of 8 golds on home soil.

Britain's Tom Daley led the field in preliminaries, helped by the highest-scoring dive so far in eight events at the Rio Olympics.

The Chinese were in close pursuit. Qui Bo, followed by teammate Chen Aisen. Qui earned silver in London; Daley took bronze.

The top 18 move to Saturday's semifinals at 9 a.m., where scores don't carry over.

MOUNTAIN BIKE

Mountain bike begins with the women's medal race starting at 10:30 a.m. on the man-made course in Rio.

The deep field is headed by world champion Annika Langvad of Denmark. Switzerland's Jolanda Neff and Canada's Catherine Pendrel are also among the favorites.

BADMINTON

Lee Chong Wei of Malaysia overcame two-time Olympic champion Lin Dan of China to advance to the finals against a younger Chinese star, Chen Long. Lee avenged his losses to Lin in the previous two Olympic finals. They play at 7:20 a.m.

CANOEING

Brazil's Isaquias Queiroz chases his third medal in Rio in the men's canoe doubles as the flatwater sprint competition wraps up. Race is 7:22 a.m.