Rafa Nadal opened his account at the ATP World Tour Finals with a 6-2 3-6 7-6 defeat of Mardy Fish in a late-night Group B thriller.
Nadal and Federer will meet in the group stage of the ATP World Tour finals starting on Sunday.
Just a week before the ATP World Tour finals, Roger Federer signalled his return to the top in timely fashion with a sensational run to the Paris Masters title.
A resurgent Roger Federer swept past local favourite Jo-Wilfried Tsonga 6-1 7-6 to clinch his maiden Paris Masters title on Sunday and send a deafening warning to his rivals ahead of the ATP World Tour finals.
American Mardy Fish is facing a race against time to be fit for the ATP World Tour finals after pulling out of the Paris Masters due to a hamstring injury.
Novak Djokovic pocketed a $1.6-million bonus just for turning up on court before making light of shoulder pains to beat Croatian Ivan Dodig 6-4 6-3 in the Paris Masters second round on Wednesday.
Ana Ivanovic celebrated her 24th birthday by successfully defending her Tournament of Champions title with a comfortable 6-3 6-0 victory over Spain's Anabel Medina Garrigues on Sunday.
Ana Ivanovic suffered an injury scare as she began the defence of her title at the Tournament of Champions with a 6-3 6-3 win over Italy's Roberta Vinci.
Statistically Caroline Wozniacki remains the best female tennis player in the world but the controversy over her number one status showed no signs of abating after her season ended in disappointment at the WTA Championships.
Australia's Samantha Stosur destroyed China's Li Na 6-1 6-0 in little more than an hour to reach the semi-finals of the WTA Championships for the second consecutive year on Friday.
Caroline Wozniacki, who celebrated becoming year-end world No 1 for the second successive year.
A weary Caroline Wozniacki was sent packing from the WTA Championships after losing 6-4 6-2 to powerful Czech Petra Kvitova in her final round-robin match on Thursday.