Roger Federer still has a chance to finish the year as the world number one after beating Nadal in the final of the Shanghai Masters.
Former British number one Greg Rusedski believes had Roger Federer not been injured in Montreal, he would probably be leading the race for world number one over Rafael Nadal.
Federer is now the only man who can prevent Nadal from finishing the year as the world's number one on the ATP rankings.
Rafael Nadal and Roger Federer will face each other for the fourth time this calendar year as they meet in the final of the Shanghai Masters on Sunday (15 October).
Federer and Nadal booked their places in the semi-finals of the Shanghai Masters with wins over Richard Gasquet and Grigor Dimitrov respectively.
Ex-coach Mark Petchey says the competition from Andy Murray, Novak Djokovic and Stan Wawrinka has made Rafael Nadal and Roger Federer even better players.
Federer is fresher than the other players going into the final weeks of the 2017 season after taking a nine-week mid-season break.
Former French Open champion Yannick Noah believes the future stars of tennis will be hoping for Roger Federer and Rafael Nadal to retire so that they can start to win more titles.
Roger Federer is 2360 points behind Rafael Nadal in their fight for the year-end number one ranking with four tournaments left to play.
Roger Federer admits that getting to 100 ATP titles will be special, but is mainly focusing on remaining healthy for the rest of the campaign.
The likes of Andy Murray, Novak Djokovic, Stan Wawrinka and Kei Nishikori will all feature in the Australian Open while Serena Williams is expected to defend her title.
Roger Federer has refused to rule out playing at the 2020 Tokyo Olympic Games ending any talk about potentially retiring in the near future.
Annabel Croft believes Rafael Nadal's decision to let his body recover has paid dividends as the world number one won his sixth title of the year after his recent China Open win.
Rafael Nadal won his sixth title of 2017 beating Nick Kyrgios in the final of the China Open and now has one more trophy than Roger Federer in 2017.
Andy Murray's ex-coach Miles Maclagan believes it will take quite a while for the next generation to emulate the success of Roger Federer, Rafael Nadal and Novak Djokovic.