ANDY Murray believes fatigue could play a part in his quarter final opponent Vasek Pospisil’s chances of upsetting the British No.1 tomorrow.

Pospisil, who beat Britain’s James Ward earlier in the tournament, has played two five-setters in a row to reach the last eight and Murray believes fatigue could be a factor.

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“I think I’m playing well. I’m through into the quarter-finals against Pospisil, which is a good opportunity for me,” said Murray, who is yet to lose to Pospisil in three previous meetings.

“I’ve played him three times on hard courts, I think a couple of them were indoors as well, so I’ve never played him on grass.

“He’s had a good run here and he obviously won the doubles here last year.

“He can play well on the surface. He’s also played a lot of tennis here, which is a positive for him in some ways but also maybe he’s a little bit fatigued.

“So if that is the case, and I won’t bank on that being the case, but if that is the case, I’ll try to use that to my advantage.”

Murray had to take treatment for a shoulder problem in his previous match against Andreas Seppi but the Briton says it has improved.

Meanwhile, Novak Djokovic survived a Court One shoot-out with Kevin Anderson to keep the defence of his Wimbledon title going.

Djokovic experienced some nervy moments on the resumption before sealing a 6-7 (6/8) 6-7 (6/8) 6-1 6-4 7-5 fourth-round success.

The world number one will face US Open champion Marin Cilic today in the quarter-finals.

In the women’s draw, Maria Sharapova has been accused of gamesmanship after moving into her first Wimbledon semi-final since 2011.

The Russian 28-year-old defeated Coco Vandeweghe 6-3 6-7 (3/7) 6-2, before coming under fire from her opponent for unsporting behaviour, Vandeweghe claiming Sharapova was moving around in her eye-line as she shaped to serve.

Sharapova will play number one seed Serena Williams in tomorrow’s semi-finals after she defeated Victoria Azarenka in three sets while Garbine Muguruza and Agnieszka Radwanska meet in the other tie.