Shot clocks were used at the Next Gen ATP Finals in Milan earlier this month
The Australian Open will use a 25-second shot clock and players may be fined for retiring or performing "below professional standards" in the first round of Grand Slams from next season.
The shot clock, trialled at US Open qualifying and the Next Gen ATP Finals, is used in between points to ensure players serve within 25 seconds.
Rafael Nadal is world number one in the men's singles ranking
A Paris court has ordered former French Sports Minister Roselyne Bachelot to pay 12,000 euros (£10,700; $14,000) to tennis star Rafael Nadal over a doping allegation.
Nadal sued her for damages, saying her comments were harmful to his image. He had sought 100,000 euros in damages.
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World number one Rafael Nadal has withdrawn from the Paris Masters with a knee injury.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.
