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(111118) -- LONDON, Nov. 18, 2011 (Xinhua) -- Roger Federer arrives for the charity gala at the Battersea Power Station in London, Britain, Nov. 17, 2011. The singles and doubles players taking part in 2011's ATP World Tour Finals attended a charity gala here on Thursday to raise funds for the new Heart and Lung Centre at London's Great Ormond Street Hospital. The finals will be held in London from Nov. 20 to 27. (Xinhua/Zeng Yi) (KEYSTONE/XINHUA/Guo Dayue)