London:Wimbledon Open, the third tennis grand slam of the year gets underway today. The Williams sisters look the favourites in the ladies draw while Tim Henman is hoping to provide some local cheer at the tournament where he just can't seem to get past the semi-finals. The most unique thing about Wimbledon is not that it's played on grass or that it offers lesser prize money to women but that it follows its own seeding system. As a result, Serena Williams is the top seed among women as Kim Clisjters and Justine Hardine are both missing because of injury. Serena has won the last two Wimbledon titles, both against her sister Venus and that scenario could well be repeated this year. Anastasia Myskina, the world number two, though is the highest ranked player in the draw. "I'm really excited. I've never been seeded second in a grand slam event and I'm the highest-ranking player right now in the draw," said Myskina. Meanwhile, Martina Navratilova, has accepted a wildcard to play at the tournament. The 9-time All England champion is making a singles comeback here after 10 years. British interest at Wimbledon promises to be at an all time high this year with Tim Henman seeded as high as fifth. Henman, however, can't seem to break out of the semi-final jinx both at Wimbledon and at the French Open last month. "I think my attitude on the court has changed quite a lot and I'm playing better than I've ever played," said Henman. Meanwhile, Roger Federer, the defending champion in the men's draw looks to be a favourite. The swiss player has the perfect serve and volley game for this surface though that didn't quite work for him at the French open. However, clay court specialist Gustavo Kuerten, Gaston Gaudio and David Nalbandian are all out because of injury.