<p>Nadal said it was a recurrence of the problems that forced him out of the defence of his Wimbledon title and away from the ATP Tour last year for more than two months. <br />There must be doubts as to whether the 23-year-old can scale the heights he did 12 months ago when he held the Australian, French and Wimbledon titles and was ranked number one in the world. <br /><br />"Don't start guys with these questions right now," Nadal told a news conference. "I think it is not the right moment. <br /><br />“It is impossible for me to know after half an hour." <br /><br />"For me it's a little bit disappointing (to) have the pain on the knee because I think I am very close to start winning these important matches," he told reporters.</p>
<p>Nadal said it was a recurrence of the problems that forced him out of the defence of his Wimbledon title and away from the ATP Tour last year for more than two months. <br />There must be doubts as to whether the 23-year-old can scale the heights he did 12 months ago when he held the Australian, French and Wimbledon titles and was ranked number one in the world. <br /><br />"Don't start guys with these questions right now," Nadal told a news conference. "I think it is not the right moment. <br /><br />“It is impossible for me to know after half an hour." <br /><br />"For me it's a little bit disappointing (to) have the pain on the knee because I think I am very close to start winning these important matches," he told reporters.</p>