The world's fastest men line up at the London Olympics Sunday in the 100-meter race where fans will be looking to see if Jamaica's Usain Bolt will be able to keep his Olympic crown.

American tennis-playing sisters Serena and Venus Williams team up Sunday for the women's doubles gold medal. Serena won the singles gold medal Saturday.

Also Saturday, American swimmer Michael Phelps ended his career with another gold medal, ending his dominance over three Olympics with 18 gold medals and 22 medallions overall.

The millionaire NBA players from the U.S. barely won their qualifying match against tough Lithuania Saturday with a score of 99-94.