Andy Murray will return to defend his Wimbledon title as the top seed followed by Novak Djokovic, Roger Federer and Rafael Nadal in the top four.

While Murray hugely impressed last year to win Wimbledon and climb the world rankings, he faces a tough battle this year after a number of problems with form and fitness over the past half a year.

Earlier this week Murray pulled out of a warm-up at Hurlingham and so far this year he has won just one title. Last week he suffered a first round exit at Queens when he was defeated by world No 90 Jordan Thompson, his ninth defeat of the season so far.

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However, Murray has an impressive record at Wimbledon and has reached at least the quarter-finals in each of the last nine years. He, and his fans, will be hoping that the form he showed in reaching the French Open semi-finals will return and that he can retain the title.

With Murray, Djokovic, Federer and Nadal taking the top four seeds, it means that they will be kept apart until the last four. This means that the earliest they could play each other is the semi-finals.

Federer has recently climbed up to fifth in the world and has an excellent grass record. He is looking for his first Wimbledon title since 2012 having won his first Grand Slam in four years at the Australian Open earlier this year where he beat Nadal in the final.

However, Nadal has also impressed this year and won a tenth French Open title to claim a fourth title of the year. On the other hand, his attempt to win a sixteenth Grand Slam will depend on how his knees hold up on court.