The Paris Masters coverage gets back underway on Sky Sports Main Arena (409) at 6.30pm, just before Federer is set to take to the court.
Maybe one of them will be able to add to the group's title haul in Paris and build momentum heading into London, where they've been much more successful over the years.
A double break of serve put Federer 4-1 up before Fognini broke back with a backhand victor down the line. It also left Paris ticketholders feeling frustrated after Roger Federer's later match with Milos Raonic was called off after Canadian Raonic also pulled out injured.
Novak is the clear favorite to finish the season as the year-end number 1 for the fifth time in his career and the first since 2015 after a rather historic season, dropping out from the Top 20 before starting a memorable run that gave him 41 wins in the last 45 matches and 20 straight wins that distanced him from the closest rivals.
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He said he was trying to play in Paris without pressure and that his major concern was regaining the ATP World Tour title in London later this month.
Rafael Nadal and Novak Djokovic are facing a backlash for accepting the offer to play an exhibition match in Saudi despite the furor surrounding the murder of journalist Jamal Khashoggi. "Single. Day", Djokovic said on Twitter, accompanied by a photo from his early years playing tennis as a kid.
It helped him to maintain the remarkable spell of form that has seen him rise from number 22 in June to the top of the game again. Bulgarian ninth seed Grigor Dimitrov, who is working with USA legend Andre Agassi in Paris, went through with a 7-6 (12/10), 6-4 victory over Spain's Roberto Bautista Agut. "So we are looking about how the situation evolves and I hope the things will clarify as soon as possible". Djokovic arrived in Paris knowing that he would regain the top spot he relinquished two years ago if he bettered the Spaniard's performance at the indoor event he has won four times.
Karen Khachanov saved two match points against John Isner on his way to defeating the eighth-seeded American 6-4, 6-7 (9/11), 7-6 (10/8).
Thiem, also in contention for the ATP Finals, next faces defending champion Jack Sock of the United States.
John Isner, however, is set to miss the Finals after losing to Karen Khachanov in a tussle featuring two tie-breaks in nearly two and a half hours.