Venus Williams still has a lot of work ahead to recapture the form that has made her a seven-time Grand Slam champion.

After joining her sister Serena in a fourth-round Wimbledon exit, Williams lost in singles and doubles before helping the Washington Kastles to a 21-18 World Team Tennis over-time victory Tuesday over reigning champion Kansas City.

The Copa America - the world's oldest international football tournament, going back to 1916, brings together some of the silkiest talents the global game has to offer.

A continental finishing school for the World Cup, or so the theory goes, the tournament allows perennial Latin American giants Brazil and Argentina a perfect opportunity to blood a new generation before, armed with the experience, they graduate to the senior tournament.

British team Williams have rekindled one of Formula One's most successful partnerships by announcing on Monday that they will team up with French manufacturer Renault for the 2012 and 2013 seasons.

The initial deal will see Renault supplying engines and chassis but the partnership could continue after the introduction of the new, energy efficient, turbo-charged V6 engines in the sport in 2014.

Rafael Nadal insists Novak Djokovic cannot keep winning and he will be first in the queue ready to pounce when the Serb finally cracks.

Djokovic, who will dethrone Nadal as world number one on Monday, also took the Spaniard's Wimbledon title on Sunday with a 6-4, 6-1, 1-6, 6-3 win, ending his opponent's 20-match winning streak at the All England Club.

Brazil's Samba Girls are through to the quarter-finals with a game to spare and warned possible rivals the United States or Sweden that they won't let the World Cup slip away this time.

Superstar Marta fired the Brazilians into the knockout round with a double and set Rosana up for the third as they demolished former winners Norway 3-0 in Wolfsburg on Sunday night.

Having ensured his first trip to a Wimbledon final and first turn at No. 1 in the rankings with a thrill-a-minute victory, Novak Djokovic dropped to his back at the baseline, limbs spread wide, chest heaving.

Moments later, he knelt and kissed the Center Court grass, while his entourage bounced giddily in unison, huddling in a tight circle up in Djokovic's guest box.

Nine-time Wimbledon champion Martina Navratilova believes it would be foolish to write off the Williams sisters as a spent force and backed the American sisters to star at the U.S. Open.

Serena Williams missed 11 months of action after injuring her foot in a freak accident at a German restaurant after winning her fourth Wimbledon title last year and then battled life-threatening blood clots on her lungs.

Rafael Nadal takes an 11-4 winning record into his Wimbledon semi-final against Andy Murray, but insists history will count for nothing in Friday's Center Court blockbuster.

Nadal, the defending champion, is aware that Murray is riding a wave of emotion from a public desperate to see an end to Britain's 75-year wait to crown a new men's singles champion.

Not content with driving a Formula One car, Australian star Mark Webber now wants to fly planes and Qantas plans to help him.

The 34-year-old Red Bull driver used a B737 flight simulator ahead of the Australian Grand Prix in Melbourne this year and spent time at Heathrow airport in London on Wednesday in the cockpit of a A380 with a training captain.

Chelsea manager Andre Villas-Boas was quick to dismiss comparisons with Jose Mourinho as he used his official introduction at Stamford Bridge to insist he is not the new 'Special One'.

Villas-Boas worked for Mourinho as an opposition scout during his fellow Portuguese's time in charge at Porto, Chelsea and Inter Milan and has spent much of his brief managerial career following in the footsteps of the controversial coach.