Paris (AFP) - Roger Federer has closed the gap on Rafael Nadal at the top of the latest ATP world rankings released on Monday (Oct 16) following his victory over the Spaniard at the Shanghai Masters.
Nadal remains well clear of Federer, but the Swiss maintains a chance of finishing the year as world No. 1 after shaving more than 400 points off his lead.
Federer claimed a surprisingly one-sided 6-4, 6-3 victory over the world No. 1 on Sunday (Oct 15) to secure a 94th career title, drawing him level with the great Ivan Lendl.
Only Jimmy Connors (109) has won more trophies.
Meanwhile, Marin Cilic reached his best ranking of fourth after his run to the semi-finals in Shanghai.
Novak Djokovic and Stan Wawrinka, whose seasons are both over due to injury, each slip a place but Juan Martin del Potro continued his climb up the rankings.
The Argentinian moved up four places to 19th, appearing in the top 20 for the first time in three years.
For the moment, only Nadal, Federer, Alexander Zverev and Dominic Thiem have confirmed their places at the season-ending Masters in London next month.
Maria Sharapova has shot up the women's world rankings following her victory in Tianjin on Sunday (Oct 15), rising 29 places to 57th in the latest WTA list.
The 30-year-old former world No. 1 triumphed 7-5, 7-6 (10-8) against teenager Aryna Sabalenka of Belarus to claim her first title since serving a 15-month doping ban.
Sharapova will hope to build on that victory this week in Moscow after being handed a wild card for the Kremlin Cup.
The top 10 remains unchanged, with Romania's Simona Halep on top ahead of Spaniard Garbine Muguruza.
Russia's Anastasia Pavlyuchenkova climbed three places to 18th after beating Daria Gavrilova in the Hong Kong Open final at the weekend.
Czech Barbora Strycova, winner of her second WTA Tour title in Linz on Sunday (Oct 15), went up one place to 25th.