(Photo: Sina)

World number one Roger Federer called it a dream to successfully defend his title at the upcoming Masters Cup in Shanghai, though his ankle injury seemed to have no bad effect on him during practice.
"My dream would be to defend the title," said the Swiss, who sustained the injury last month, at a news conference Saturday after a brief opening ceremony of the year-ending ATP event which goes underway on Sunday.
"The expectations are...any way, low," he said. "I just hope I can play a good match really. In practice it (the injured ankle) did work, but for match, it's quite different."
"I've given everything I could to do right in this tournament.
I did practice, I got in Shanghai early and I have a great record indoors. Obviously, my dream would be to defend the title."
Federer sustained the injury while practising four weeks ago and was forced to skip the Madrid and Paris Masters as well as the Basel tournament last week.
And he yet worried a lot about it though his recovery has been fairly quick.
"I'm a very positive person, but there's occasions that I could be a little bit passivated, feeling that I could not improve any more," he said.
"Sometimes I thought I was two steps forward and one step back. You would never like the back thing. I don't want to take that, and I knew that something goes wrong.
"So what I have to do is to make sure that I'm very very careful about my ankle. When I take a shower...I don't wanna mistake anything.
"I'm happy to have make this (taking part in the tournament) possible, because I've been here after injury. It never happened to me before, so I don't know how long injury like this would take. "
Injuries have forced the withdrawal of some of the biggest names in Shanghai, including the world number three Andy Roddick due to back pain, Russia's Marat Safin with a nagging knee injury.
Federer has been drawn in the Red Group alongside with Argentina 's Guillermo Coria and David Nalbandian, as well as Croatia's Ivan Ljubicic.
The top two finishers in each group qualify for the semi-finals of the US$4.45 million tournament, featuring the top eight players for the season.