Day 9 of the Rio Games features medal action in track and field, gymnastics, tennis, golf, fencing and more. Here are some things to watch (all times local):
Jamaica's Usain Bolt will look for an unprecedented third straight gold in the 100-meter sprint Sunday. He won this heat Saturday. (AP Photo/David J. Phillip)
TRACK AND FIELD
The title of world's fastest man goes on the block when Jamaican Usain Bolt, American Justin Gatlin and the other sprinters take to the track. The 100 meter final is at 10:25 p.m. following three rounds of semifinals that start at 9 p.m.
Bolt won his first heat of the games in 10.07 seconds Saturday. He's still a favorite for an unprecedented third straight gold, despite a sore hamstring that forced him from the world championships last month.
Gatlin took Saturday's fastest time in the heats.
Gatlin in his heat Saturday. (AP Photo/Jae C. Hong)
Andrew Fisher, a Jamaican who competes for Bahrain, Jamaican Yohan Blake, Americans Marvin Bracy and Trayvon Bromell and Frenchman Christophe Lemaitre also qualified for the semis.
The 400 finals, at 10 p.m., is shaping up to be a titanic showdown between LaShawn Merritt, Kirani James and Wayde van Niekerk.
Defending Olympic champion James ran the fastest time of the heats Friday. Merritt is the 2008 champion and van Niekerk is a South African who surprised those two to win the world championships last year.
Women take to the track for the 400 semifinals starting at 8:35 p.m. Shaunae Miller, of the Bahamas, has the fastest time in the event this year. Competition in the finals should include Americans Allyson Felix and Phyllis Francis.
Miller competes in a 400-meter heat Saturday. (AP Photo/David J. Phillip)
For the first time in an Olympics, triplets will compete in an event. The Luik sisters from Estonia are part of the marathon field that heads out at 9:30 a.m.
Leila, Liina and Lily Luik take a selfie Friday in Rio de Janeiro. (AP Photo/Rob Harris)
Olympic all-around champion Simone Biles goes for her third gold in Rio when she competes in the women's vault final at 2:47 p.m. The 19-year-old already has two golds during the games after leading the "Final Five" to the team title and becoming the fourth straight American woman to win the all-around last week. Biles' biggest challenge will come from Russia's Maria Paseka, who upset Biles at the 2015 world championships.
Biles on the vault during the women's individual all-around final Thursday. (AP Photo/Julio Cortez, File)
Oksana Chusovitina of Uzbekistan, competing in her record seventh Olympics, will also try to reach the podium. The 41-year-old captured silver on the vault in Beijing in 2008.
Two other members of the "Final Five" will attempt to add to their medal haul.
World champion Madison Kocian posted the top score during qualifying for the uneven bars, finals for which are held at 4:21 p.m. Gabby Douglas, the Olympic all-around champion in 2012, is also in the final, as is defending Olympic uneven bars champion Aliya Mustafina of Russia.
Kocian on the uneven bars Sunday. Aug. 7. (AP Photo/Julio Cortez)
British teammates Louis Smith and Max Whitlock will square off in the pommel horse final at 3:34 p.m. The field also includes American Alex Naddour and Ukrainian Oleg Verniaiev, who was a narrow second to Japan's Kohei Uchimura in the men's all-around last week.
Whitlock on the vault during the all-around final Wednesday. (AP Photo/Julio Cortez)
Americans Sam Mikulak and Jake Dalton posted the top scores during qualifying on men's floor exercise. Uchimura and Brits Whitlock and Christian Thomas are also in the group of eight finalists who start at 2 p.m.
Defending champion Andy Murray of Britain tries to become the first player to win two Olympic singles golds, facing Juan Martin del Potro of Argentina in the men's final at 3:30 p.m.
At 1:30 p.m. Rafael Nadal plays Japan's Nishikori Kei for the bronze.
Murray during his semifinal win over Nishikori on Saturday. (AP Photo/Vadim Ghirda)
Venus Williams can become the first tennis player with five career golds, pairing with Rajeev Ram against Bethanie Mattek-Sands and Jack Sock in an all-American mixed doubles final at 2 p.m.
The women's doubles gold will either go to Martina Hingis and Timea Bacsinszky of Switzerland or Ekaterina Makarova and Elena Vesnina of Russia. They play at 12 p.m. At 1:30 p.m. Rafael Nadal plays Japan's Nishikori Kei for the bronze.
Williams and Ram celebrate after their semifinal win over India on Saturday. (AP Photo/Charles Krupa)
Britain's Justin Rose made two eagles in the opening five holes Saturday on the way to a 6-under 65, giving him a one-shot lead over Sweden's Henrik Stenson going into the final round at Olympic Golf Course. Play begins at 7 a.m. on the way to the awarding of golf's first Olympic medals since 1904.
Rose tees off on the 16th on Saturday. (AP Photo/Alastair Grant)
The U.S. men's team plays France at 2:15 p.m. and they're being dogged by questions over where the dominating team of years past has gone. The U.S. has had two straight close games, against Australia and Serbia. France routed Venezuela on Friday.
At 12:15 p.m., the U.S. women play the Chinese. The Americans were out of synch Friday against Canada, but turned up the defense and still won.
United States' Carmelo Anthony, center, grabs a rebound in front of Serbia's Bogdan Bogdanovic (7) on Friday. (AP Photo/Eric Gay)
Women's quarterfinals start at 4 p.m. Americans Kerri Walsh Jennings and April Ross will be back out for a midnight match, facing Australia’s Taliqua Clancy and Louise Bawden.
Walsh Jennings, right, and Ross celebrate winning a point against Italy on Saturday. (AP Photo/Petr David Josek)
The men's light fly final bout is at 2:15 p.m., featuring Uzbekistan's Hasanboy Dusmatov against Colombia's Yurberjen Herney Martinez. Dusmatov on Friday beat American Nico Hernandez, who will get bronze and end a medal drought for the U.S. that stretched to 2008.
Dusmatov punches Hernandez during their semifinal match Friday. (AP Photo/Frank Franklin II)
The men's epee team gold medal match starts at 6:30 p.m. Individual gold medalist Sangyoung Park will start his day against Hungary at 10:30 a.m.
Park , right, competes with Geze Imra of Hungary on his way to win a men's individual epee gold on Tuesday. (AP Photo/Andrew Medichini)
In the velodrome, defending gold medalist Jason Kenny meets Callum Skinner in an all-Brit final in the men's sprint at 5:40 p.m. The medals will give Britain four golds and five overall through the first six events of the 10-event program.
Kenny readies to compete in the men's sprint quarterfinals Saturday. (AP Photo/Patrick Semansky)
Wrestling might look like a brand new sport to the casual viewer when it makes its Olympic return Sunday when Greco-Roman grapplers take to the mat.
The world's oldest sport underwent major changes after being forced to apply for reinstatement to the IOC in 2013.
Matches now feature two 3-minute periods with cumulative scoring, a move designed to stop wrestlers from sitting on a lead as they often did under the old best-of-three format.