Ryan Lochte booked two Olympic berths and set himself up as a longshot for one more Saturday with a gritty treble on the sixth day of the U.S. Olympic swimming trials.

Lochte opened his night with a triumph in the 200m backstroke, giving himself a chance to defend the gold medal he won in Beijing.

Serena Williams believes her Center Court scare against China's Zheng Jie was the perfect preparation for the sterner tests that lie ahead in the second week of Wimbledon.

Four-time champion Serena narrowly avoided an embarrassing third round exit on Saturday as she fought back from a set down to grind out a gritty 6-7 (5/7), 6-2, 9-7 victory over the tenacious Zheng.

Andy Murray reached the Wimbledon fourth round on Saturday with a 7-5, 3-6, 7-5, 6-1 win over Marcos Baghdatis in a match which finished just past the 11:00pm Centre Court curfew.

The fourth seed will face Croatia's Marin Cilic, who clinched victory over Sam Querrey in the second longest match in tournament history, on Monday for a place in the quarterfinals.

Two-time Olympic runner-up Allyson Felix ran the sixth-fastest women's 200 meters in history on Saturday, winning the final at the U.S. Olympic Track and Field Trials in 21.69 seconds.

Felix, embroiled in controversy over a deadlock for the final 100m Olympic spot, served notice she will be a gold favorite in London by surging to the lead quickly and leaving behind a world-class field to set a personal best.

An attempt by British-Australian woman Penny Palfrey to swim unassisted from Cuba to Florida ended in failure early Sunday after she had to be pulled out of the water unable to cope with a strong ocean current.

"Penny Palfrey had to be pulled out of the water, after swimming for more than 40 hours," the team said in a tweet.

Australian Honda rider Casey Stoner won Saturday's Dutch Moto GP here after a terrific battle with Spain's Dani Pedrosa, also on a Honda.

Stoner started on pole but soon found himself behind Pedrosa before retaking the lead with nine laps remaining and surging clear to win by a comfortable margin.

Lukas Rosol, the shock Wimbledon conqueror of Rafael Nadal, returned to familiar anonymity on Saturday when Germany's Philipp Kohlschreiber sent him crashing out in the third round.

Czech world 100 Rosol had caused one of the greatest upsets in the history of the sport when he beat world number two Nadal in five sets in the second round under the Centre Court roof on Thursday.

Roger Federer believes the £80 million roof on Wimbledon's famed Centre Court has made a lottery out of the pursuit of the championship title.

The great Swiss, chasing Pete Sampras's record of seven titles, survived an epic battle to defeat France's Julien Benneteau on Friday to reach the last 16.

UEFA president Michel Platini on Saturday suggested that the 2020 edition of the European Championships may be held across Europe, instead of in one or two host countries in what will be its 60th anniversary.

"It's an idea," Platini told a news conference in the Ukrainian capital, Kiev. "There's nothing definitive. In December or January, we will decide whether we will take a bid for one country or two or all of Europe."

Sammy Lee remembers it vividly: food rationing, bombed-out buildings, rubble.

The year was 1948, and London was hosting the Olympics amid severe austerity in the aftermath of World War II. Lee, an American diver, and fellow amateur athletes slept on cots at local air bases and schools, brought their own towels and were ferried to events in old London buses.