Nadal's big chance to exact revenge
Novak Djokovic is running on empty, Rafael Nadal hasn't played in more than a month and the pressure always increases on Andy Murray when he competes in England. So, naturally, things look rosy for a surging Roger Federer at the ATP's World Tour Finals.
Or do they?
Here's a breakdown of the two groups beginning with Group B, which kick-starts action Sunday in the elite eight-man tournament. And rejoice, fans: We're guaranteed at least one Nadal-Federer blockbuster in London.
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