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Azarenka is a two-time Grand Slam champion, having lifted the Australian Open in 2012 and 2013

Belarus' Victoria Azarenka will miss this weekend's Fed Cup final against the United States as she continues to battle for custody of her baby son.

Azarenka is unwilling to leave California, where a judge has ruled 10-month old Leo must stay until his future is decided.

Rafael Nadal beat Pablo Cuevas in three sets on Thursday

World number one Rafael Nadal has withdrawn from the Paris Masters with a knee injury.

The Spaniard was due to face Serb Filip Krajinovic in the quarter-finals on Friday, but pulled out with a right knee problem before the match.

Rafael Nadal won the French Open and US Open in 2017 to give him 16 Grand Slam titles overall

Rafael Nadal will end 2017 as world number one after a second-round win over Hyeon Chung at the Paris Masters.

The Spaniard, who has risen from ninth at the start of the year via French and US Open victories, advanced 7-5 6-3 in one hour and 48 minutes.

Only Jimmy Connors, who won titles from 1971-88, has won more matches in the Open era than Federer

Wimbledon champion Roger Federer beat world number one Rafael Nadal 6-4 6-3 in the Shanghai Masters final to capture his sixth title of the year.

The 36-year-old Swiss, who has lost only four times in 2017, was again in imperious form as he won in 72 minutes.

Fabio Fognini is ranked 28th in the world

Fabio Fognini has been fined $96,000 (£72,806) and given a suspended Grand Slam ban after verbally abusing an umpire at the US Open in September.

The Italian used insulting language towards Louise Engzell in his first-round defeat by Stefano Travaglia.