The following scenerio could be really interesting

timnz

Legend
If Federer beats Murray (and that is not an assured outcome by any means) and Raonic beats Nishikori - the the group standings after all round robins are played will be

Federer -3 wins, 0 losses

Murray - 1 win, 2 losses

Raonic - 1 win, 2 losses

Nishikori - 1 win, 2 losses


I guess the count back will decide who the number 2 guy in the group will be. But if Federer wins against Murray - it will make the last match of Raonic vs Nishikori really interesting (is it played after Federer/Murray?).
 
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