Novak Djokovic believes a sudden back injury which threatened to sabotage his titanic US Open final battle with Rafael Nadal on Monday helped him over the finish line.

The world number one Serb trium

Serena Williams was at the centre of another US Open controversy on Sunday when she unleashed a tirade of abuse at the umpire before slumping to defeat in the final to Australia's Samantha Stosur.

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Samantha Stosur out-played three-time champion Serena Williams 6-2, 6-3 to win the US Open on Sunday, claiming the first Grand Slam title of her career in a stormy final.

Stosur kept her composure as

World number one and top seed Novak Djokovic saved two match points before defeating five-time champion Roger Federer 6-7 (7/9), 4-6, 6-3, 6-2, 7-5 and reach the US Open final for a third time on Satu

Defending champion Rafael Nadal booked a US Open title showdown against world number one Novak Djokovic on Saturday with a bruising 6-4, 6-2, 3-6, 6-2 win over British fourth seed Andy Murray.

Nadal,

World number four Andy Murray turned back the challenge of big-serving American John Isner 7-5, 6-4, 3-6, 7-6 (7/2) on Friday to reach the semi-finals of the US Open.

The 24-year-old Scot withstood 1

Defending champion Rafael Nadal and world number four Andy Murray guaranteed a US Open Super Saturday line-up on Friday, completing an all-star, top-four lockout of the semi-final places.

Second seed

India's Rohan Bopanna and his Pakistani partner Aisam-ul-Haq Qureshi crashed out of the men's doubles semi-final at the US Open Tennis Championships with a 2-6, 6-7(4) loss to the Polish pair of Marci

Top-seed Caroline Wozniacki overcame a late wobble to defeat German 10th seed Andrea Petkovic 6-1 7-6 on Thursday and set up a U.S. Open semi-final showdown against her role model, Serena Williams.

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Top seed Novak Djokovic advanced to the semi-finals of the U.S. Open on Thursday when his Serbian Davis Cup team mate Janko Tipsarevic retired in the fourth set of their quarter-final match.

Djokovic