World No. 1 Rafael Nadal on Wednesday shockingly crashed out of the tournament, while Andy Murray, Vera Zvonareva and Kim Clijsters continue their battle into semi finals of Australian Open.

Biggest favorite Nadal was defeated by 7th seed Spanish David Ferrer 4-6, 2-6, 3-6 in two hours and 33 minutes to ends his "Rafa Slam" bid to collect his 4th straight Grand Slam title to complete a non-calendar year Grand Slam.

Nadal called for medical timeout after three games in first set due to an upper leg hamstring injury or back injury. When he returned, his body language to his coach in the players box was not good. Despite receiving treatment after the fifth game, he lost the first set 6-4.

Nadal then played poorly in the second and third set, as he looks to have difficulties running and moving side to side of the court.

"It's not easy because Rafa is a gentleman and he was playing with [an] injury and we are friendly," Ferrer, a fellow Spaniard and Davis Cup teammate of Nadal's, told reporters in Melbourne on Wednesday.

"I got lucky because he was injured in the first set, but I did my game and I fight a lot...his injury, sometimes it's not easy."

After the game, Nadal said crashing out of the tournament is difficult for him, and he refused to anything about the injury.

Nadal said he thinks Ferrer played at a very high level. He congratulate him and wish him all the best for the semifinal.

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