Wimbledon winner Petra Kvitova crumbled in the first round of the U.S. Open on Sunday, as Maria Sharapova showed her championship mettle with a battling victory.

Kvitova tumbled out of the tournament at the hands of unheralded Romanian Alexandra Dulgheru while Sharapova -- who she beat for the Wimbledon crown -- eked out a three-set win over British teenager Heather Watson.

New Argentina coach Alejandro Sabella has described his team's clash with Venezuela in India on Friday as more than just a friendly because expectations are so high.

"It is an extremely important match both for me and the team. There are huge expectations from us back home and it is a big responsibility," Sabella told Tuesday's Times of India ahead of the match in Kolkata.

A 70-year-old grandfather waded into the chilly sea on Tuesday in a bid to become the oldest person to swim across the English Channel.

Roger Allsopp set off from Shakespeare Beach in Dover, southeast England, at 8:00am (0700 GMT), heading for Cap Gris-Nez on the northeast French coast, some 21 miles (34 kilometers) away.

Red Bull technical chief Adrian Newey revealed he was scared for his drivers' lives in Sunday's Belgian Grand Prix - after sending them out to race on potentially-dangerous tires.

Newey experienced death at close quarters in 1994 when he designed the Williams car in which Brazilian legend Ayrton Senna was killed at the San Marino Grand Prix.

Manchester United handed Arsenal its heaviest loss under Arsene Wenger on Sunday with Wayne Rooney scoring a hat trick in a humiliating 8-2 drubbing in the Premier League that only compounded the London club's early-season troubles.

Having seen cross-city rival Manchester City thrash Tottenham 5-1 earlier in the day, United responded in style with Ashley Young, Danny Welbeck, Nani and Park Ji-sung joining Rooney on the scoresheet.

Michael Schumacher has rarely been so content with a fifth-place finish in his distinguished Formula One career, but after starting Sunday's Belgian Grand Prix in last place he had good reason to be happy this time.

The seven-time former F1 champion had crashed his car during the first lap of Saturday's qualifying session, dampening his mood as he celebrated his 20th anniversary in the sport on the Spa track where he made his debut in 1991.

Defending Formula One champion Sebastian Vettel won the Belgian Grand Prix on Sunday to strengthen his overall lead with seven races remaining.

Vettel started from pole position to win his seventh race of the season and 17th of his career. The German led Red Bull to a 1-2 finish with Mark Webber finishing close behind.

Lewis Hamilton has crashed out of the Belgian Grand Prix after clipping a rival car and spinning into the barriers.

The British driver, who was in third place in the drivers' championship heading into Sunday's race, pushed too hard to overtake driver Kamui Kobayashi on the Spa circuit and bumped into the side of the Japanese driver's Sauber.

With a strong finishing kick on his carbon-fiber blades, double-amputee sprinter Oscar Pistorius swept past several able-bodied runners in the 400 meters Sunday to qualify for the semifinals at the world championships.

It also was another historic breakthrough for Paralympic athletes.

Mark Webber celebrated turning 35 on Saturday by signing a one year extension to his Red Bull contract for the 2012 season.

The Australian, who topped the times in practice Friday for Sunday's Belgian Grand Prix, said: "I want to continue racing at the top in Formula One so it’s a no-brainer to remain at Red Bull Racing for another year.