LONDON (CNN) — Michael Phelps will swim for more gold Friday at the 2012 Games, competing in the final individual race of his storied Olympic career. Meanwhile, attention will begin to shift to Olympic Stadium as the track and field competition gets under way.
Phelps, already the most decorated Olympian in history, swims the 100-meter butterfly Friday night. He is seeking his third gold medal of the 2012 Games and his 17th overall. He has said he plans to retire after the Games.
It was this same race four years ago that produced one of the most famous photos of the Beijing Games.
Shot from the bottom of the pool, the photo shows Phelps in one lane, Milorad Cavic in the other -- both lunging for Olympic gold.
Phelps won the race by .01 seconds after catching the Serbian swimmer gliding to the wall as Phelps took a quick, final stroke. Cavic will be among the competitors again Friday night, as will Chad le Clos -- who beat Phelps in the last few meters of the 200-meter butterfly Tuesday.
In track and field, American sprinter Allyson Felix will race twice in the 100-meter preliminaries, seeking a spot in one of Saturday's semifinals.
Her competition opens a few weeks after she sprinted to a tie with Jeneba Tarmoh in the Olympic Trials. On the day of a scheduled runoff , Tarmoh backed out. Tarmoh is still part of the U.S. team as a member of the relay pool.
In Tennis, Britain's Andy Murray plays Novak Djokovic of Serbia in one men's singles semifinal. In the other, Roger Federer of Switzerland matches up with Argentina's Juan Martin del Potro. The women also play singles semifinals; those matches pit Serena Williams of the United States against Victoria Azarenka of Belarus, and a battle of Russians, Maria Sharapova and Maria Kirilenko.
In football, Brazil, with its great player Marta faces World Cup champion Japan while the United States plays New Zealand.
In Judo, 16-year-old Wojdan Shaherkani of Saudi Arabia was allowed to compete wearing a headscarf, but lost in her elimination match Friday to Melissa Mojica of Puerto Rico in 82 seconds.
Officials initially said they would not allow her to compete in the headscarf, but Shaherkani's father and Saudi officials insisted she would not compete without it.
Shaherkani, who was competing at her first major international event, received a special invitation to compete from the International Olympic Committee.
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