Roger Federer and Rafael Nadal will stage the last chapter of their battle to finish the year as world number one when the ATP Tour Finals get under way in London on Sunday.

Roger Federer will face US Open champion Juan Martin del Potro, Andy Murray and Spain's Fernando Verdasco in the tougher of the two round robin groups for the ATP World Tour Finals here.

Kazakhstan will make their Hopman Cup debut next year, after winning the Asian Hopman Cup.

Novak Djokovic of Serbia secured back-to-back ATP titles on Sunday by edging past battling Frenchman Gael Monfils 6-2, 5-7, 7-6 (7/3) in a thrilling Paris Masters final.

Novak Djokovic reached the final of the Paris Masters for the first time by overpowering second-seeded Rafael Nadal 6-2, 6-3 on Saturday.

Second seed Rafael Nadal set up a Paris Masters semifinal clash with third seed Novak Djokovic on Friday by defeating title-holder Jo-Wilfried Tsonga 7-5, 7-5.

Battling Rafael Nadal moved into the Paris Masters quarterfinals on Thursday with a 6-3, 3-6, 7-5 win over Tommy Robredo underlining his threat to unseat Roger Federer as world No.1 by the end of the season.

Top-ranked Roger Federer lost to Julien Benneteau of France 3-6, 7-6 (4), 6-4 in the second round of the Paris Masters on Wednesday, continuing his miserable run at the indoor event.

Defending champion Jo-Wilfried Tsonga and sixth-seeded Nikolay Davydenko won second-round matches at the Paris Masters on Tuesday to keep their hopes alive of qualifying for the eight-man ATP World Tour Finals.

Marat Safin extended his career by at least one more round, saving three match points Monday to beat French qualifier Thierry Ascione 6-4, 4-6, 7-6 (3) at the Paris Masters.