England's Mark Selby observes during the first round match against England's Ricky Walden at the 2009 World Snooker Championship in Sheffield, England, April 20, 2009. Selby advanced to the next round by winning the match 10-6. [Xinhua/Zeng Yi]

 Northern Ireland's Joe Swail hits the ball during the first round match against Marco Fu from Hong Kong of China at the 2009 World Snooker Championship in Sheffield, England, April 20, 2009.[Xinhua/Zeng Yi]