Rafal Nadal nervous

Rafael Nadal will not worry about results as he makes his latest comeback from persistent knee problems.
The 26-year-old Spaniard won the French Open this year but missed the last six months of the season after playing at Wimbledon when he knew he was not fully fit.
Now he is ready to return at an exhibition tournament in Abu Dhabi next week, although he admits his knee is still not 100 per cent and his focus is not on results.
'I am not nervous,' he told The Times. 'The only thing is the knee.
'The rest of the things - I can play better, I can play worse - it doesn't matter how I play tennis in the next month or month and a half.
'For me my goal is not Abu Dhabi, it is not Doha, it is not the Australian Open - my goal is to try to be fit, to be 100 per cent recovered with my knee and 100 per cent fit in my personal performance by Indian Wells and Miami [in March], to try to arrive to Monte Carlo and the clay-court season in good shape.'
He added: 'It will take time. The people have to know when you are outside of the competitions and haven't played for a long time, you will have problems to come back to your best.'
The 26-year-old Spaniard is set to play an exhibition tournament in Abu Dhabi on Dec. 27. It will be his first action since he was sidelined with tendinitis in his left knee after a second-round loss to 100th-ranked Lukas Rosol at Wimbledon in June.
The injury prevented Nadal from defending his Olympic singles gold at the London Games, where he was supposed to be Spain's flag bearer in the opening ceremony. He also had to pull out of the U.S. Open and Spain's Davis Cup final against the Czech Republic, which his teammates lost without him.
The 11-time Grand Slam winner and former No. 1 player said his knee had improved over the last two months after making frustratingly little progress during the summer.
Even so, he acknowledged that he may have to skip some more events to get back to full speed.
"I'm prepared to accept that at the start my knee might not respond well and I may have to take it easy, mixing periods of play and rest for the first three months," he said.