Wimbledon champion Rafael Nadal has pulled out of this week's Stuttgart Cup tournament due to a knee injury, the Spaniard said on Monday. "My doctors have said I need a couple of days rest. I will now get examined for an exact diagnosis," Nadal was quoted saying at a news conference in Stuttgart by SID German sport news agency

"I only want to return to the court once I am 100 percent fit," the 22-year-old said, adding he was exhausted after playing continuously for four or five months.

Nadal, four-times a French Open champion, became the first Spaniard in over four decades to win the Wimbledon men's singles title on Sunday after defeating Roger Federer.

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