World number one Roger Federer has pulled out of next month's Japan Open and Shanghai Masters because of fatigue. "After consultation with my team and doctors, I decided to take the difficult decision to withdraw from both tournaments so that I can give my body a chance to rest, rehabilitate and fully recover from a physically challenging year," the Swiss star said on his website rogerfederer.com. "I am disappointed that I have to withdraw from Tokyo and Shanghai as they are two of my favorite cities in the world and the fans have been great to me over the years."