Tennis balls over Golden Balls for Roger Federer at Wimbledon

David Beckham and Bradley Cooper were among those watching Roger Federer at Wimbledon on Wednesday but the Swiss insists only tennis stars make him nervous.

Football favourite Beckham and Hollywood actor Cooper witnessed Federer come back from two sets down to beat Marin Cilic in the quarter-finals, meaning the 34-year-old is now two wins away from an 18th grand slam title.

Was he aware of the A-list celebrities in the crowd?

David Beckham speaks to Roger Federer's wife, Mirka, during day nine at Wimbledon
(Anthony Devlin/PA)

"I didn't see them before the match, didn't see them after the match, didn't speak to them before the match, didn't speak to them after the match. But it was nice to see them there," Federer said.

"At the end of the day today what makes me nervous is really legends of our sport. That's the only thing that still gets me nervous, when I see guys sitting watching my match.

"When I see them watching, I feel like I better play well. You don't want to disappoint legends of our sport."

On the menu today

Angelique Kerber stretches behind the baseline during her win over Simona Halep

Centre Court was treated to two five-set thrillers on Wednesday but the tournament turns its attention back to the women's draw on Thursday in the form of two tasty semi-finals. Favourite Serena Williams takes on the Russian outsider Elena Vesnina before Australian Open champion Angelique Kerber plays Venus Williams, the oldest grand slam semi-finalist since Martina Navratilova at Wimbledon in 1994.

Who's toast today?

The unseeded Elena Vesnina beat Dominika Cibulkova to face Serena Williams
(Tim Ireland/AP)

Vesnina has never gone past the fourth round at a grand slam before and the world number 50 has beaten some strong opponents along the way in SW19. But she has lost all four of her previous matches against Serena Williams and was unable to take a set in any of them. Vesnina has enjoyed a superb run but it will surely end here.

Haven't we met before?

The Williams sisters could face each other in the final and are currently competing in the doubles together
(John Walton/PA)

Kerber has won three of her five previous meetings with Venus Williams, although it was the American who won their most recent match-up at the Canadian Masters two years ago. There is also some family business to settle. Kerber was the surprise conqueror of Venus' sister Serena at the Australian Open final in January, depriving the world number one of a record-equalling 22nd major title. Serena may well have offered her older sibling some friendly words of advice.

The best of British

Heather Watson impresses during the doubles at Wimbledon
(Steve Paston/PA)

Andy Murray will be resting up ahead of Friday's semi-final against Tomas Berdych but there are other British players in action. In the third round of the mixed doubles, Heather Watson and Henri Kontinen play Leander Paes and Martina Hingis last on Court One, while in the quarter-finals of the new wheelchair singles event Jordanne Whiley and Lucy Shuker go head-to-head in an all-British clash on Court 16. On Court 12, 18-year-old Gabriella Taylor faces American Kayla Day in the last eight of the girls' singles.

Centre court order of play

Serena Williams celebrates after another dominant victory
(Steve Paston/PA)

Serena Williams v Elena Vesnina (1pm); Angelique Kerber v Venus Williams; Pierre-Hugues Herbert & Nicolas Mahut v Treat Huey & Max Mirnyi.

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