Toting his third gold medal of the London Games, Usain Bolt gave a little wave to 80,000 or so of his best friends in the Olympic Stadium stands.

Almost immediately, the questions started: What did that mean? Was Bolt bidding adieu for good? Will the world get to watch him sprint on his sport's biggest stage again in 2016?

"It was a goodbye to London. I was just having fun with the crowd," the Jamaican explained.

He accomplished exactly what he wanted to at the 2012 Olympics. Three events -- the 100 meters, 200 meters and 4x100 relay -- and three victories. Plenty of pre- and postrace preening. Just as in Beijing in 2008.

As for trying to go for a Triple Triple four years from now, Bolt insisted Rio de Janeiro isn't necessarily in the offing. "The possibility is there, but it's going to be very hard. ... I've done all I want to do," said Bolt, who turns 26 on Aug. 21. "I've got no more goals."

Bolt pointed out that he'll turn 30 in 2016, while the closest thing he has to a rival, training partner Yohan Blake, will be only 26.

Even other athletes are among those curious about Bolt's future. Maybe he'll take up the long jump. Maybe the 400 (although he says that's too much of a grind for his tastes).

"It's very, very difficult to predict what's going to happen in four years. For Usain, he's just enjoying the moment and living in today," said Sanya Richards-Ross, who won gold medals in the 400 and the 4x400 relay for the United States. "I don't think he can do any wrong in most people's minds."

As for her own future, Richards-Ross said in an interview with The Associated Press that she wants to compete in Rio in 2016 but can't fully commit to anything until the Games get a little closer. She plans to run the world championships next year, then take a year off before making a commitment. Richards-Ross, 27, has competed in three Summer Games.

Meanwhile, basketball star Diana Taurasi's already impressive Olympic resume isn't finished. The U.S. shooting guard has three gold medals and says she will be at the Rio Games looking to win a fourth.

Taurasi, 30, averaged a team-high 12.4 points in London to lead the U.S. to its fifth consecutive gold medal.

Anti-doping effort: IOC President Jacques Rogge said efforts to fight doping at the Games were a success.

Through Sunday morning, only one athlete tested positive for a banned substance on the day of competing at the London Games. Seven more were caught in doping controls conducted since the official testing period for the games began July 16. One of the seven competed in London before her test result was known.

"I think that is a sign that the system works," Rogge said at a news conference.

Rhythmic gymnastics: It's a clean sweep for Russia in rhythmic gymnastics, just as it's been at the last three Olympics. The Russians won their fourth straight gold medal in the group event Sunday, easily beating Belarus. With Evgeniya Kanaeva winning the individual all-around Saturday, Russia now has won both rhythmic titles at every Olympics since 2000.

Mountain bike: World champion Jaroslav Kulhavy of the Czech Republic won a two-man sprint to take the gold medal in the mountain bike race. Kulhavy made the most of a final steep ascent on the technical circuit in the English countryside to move ahead of Nino Schurter of Switzerland and then sprinted to the line. Schurter won the silver medal and Marco Aurelio Fontana of Italy took bronze.

Handball: France won its second consecutive Olympic gold medal in men's handball with a 22-21 win over Sweden.