Roger Federer and Serena Williams bestride their respective tennis worlds rather as Everest and K2 dominate the Himalayas.They may be just two amongst many world-beating champions, yet they remain the standard against which those others are measured.They can be conquered by the fittest, most ambitious, most determined of individuals, just as those two mighty mountains can, but they remain head and shoulders above the rest. The rankings say it all.Williams has topped the women’s tour since November 2009 and is currently more than 1,500 points clear of the field. Federer has topped the ATP rankings since Wimbledon 2009 and currently towers over the chasing pack by more than 3,000 points.This is all the more striking because the two No1s of tennis have been notable by their absence since...

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