![Switzerland's Roger Federer celebrates winning the second set against Argentina's Juan Martin Del Potro during their ATP World Tour Finals tennis match at the 02 Arena in London November 26, 2009. REUTERS/Dylan Switzerland's Roger Federer celebrates winning the second set against Argentina's Juan Martin Del Potro during their ATP World Tour Finals tennis match at the 02 Arena in London November 26, 2009. REUTERS/Dylan](https://c8.alamy.com/comp/2E790CK/switzerlands-roger-federer-celebrates-winning-the-second-set-against-argentinas-juan-martin-del-potro-during-their-atp-world-tour-finals-tennis-match-at-the-02-arena-in-london-november-26-2009-reutersdylan-martinez-britain-sport-tennis-2E790CK.jpg)
Switzerland's Roger Federer celebrates winning the second set against Argentina's Juan Martin Del Potro during their ATP World Tour Finals tennis match at the 02 Arena in London November 26, 2009. REUTERS/Dylan
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Roger Federer, Novak Djokovic, Rafa Nadal joined on unbelievable list by German veteran - Tennishead
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