The world's fastest man saved his best for last. In what he said is his final race, Usain Bolt won gold in the 4x100-meter relay on Friday to become the first man in history to win sprinting's elusive "triple triple."

The U.S. team of Tianna Bartoletta, Felix, English Gardner and Tori Bowie clocked 41.01 seconds, the second-fastest time ever, to beat Jamaica on 41.36 and Britain on 41.77. The Americans had nearly missed out on a place in the final, after Felix dropped the baton when handing over to Gardner in their heat on Friday morning.

The United States women's basketball team will be out to prove their credentials as one of the Olympics' great sporting dynasties on Saturday when they take on Spain in the gold-medal final.

The United States continued their reign over Spain with a grinding 82-76 win on Friday to put them through to the gold medal final of the men's basketball tournament for a third straight Olympics.

The International Olympic Committee (IOC) has set up a disciplinary commission for United States swimmer Ryan Lochte and his three team mates after they were found to have lied about an armed robbery during the Rio Olympics, an IOC official told Reuters on Friday.

Double Olympic champion Ashton Eaton threw out a challenge on Thursday to come up with ways to make the decathlon more exciting, suggesting that most spectators fail to grasp the intensity of the arduous event.