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?).
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?).