Djokovic did not drop a set en route to the final in Rome
The US $380,000 ATP Tour event will be held at the newly-laid synthetic courts of the CCI in Mumbai, in September.
Rafael Nadal claimed his first grasscourt title for five years.
He may have entered the semifinal as the underdog, but Jannik Sinner's stunning victory over overwhelming favourite Novak Djokovic left the Melbourne crowd shocked.
Having dug in early on to stay with Federer, Nishikori ended up running away with the match to inflict a first straight sets defeat in the ATP Finals round-robin stages on the 20-time Grand Slam champion.
Laslo Djere won his first ATP title at the Rio Open on Sunday and then captured the hearts of the Brazilian crowd with a victory speech dedicated to his parents, both of whom died from cancer.
Zverev has consistently denied all the allegations.
Novak Djokovic turned on the style to outclass old adversary Rafael Nadal and reach the final of the ATP World Tour Finals with a 6-3, 6-3 victory at the 02 Arena in London, on Saturday.
The restart has divided opinion among the players, with some 200,000 new COVID-19 cases being reported globally every day and international travel restrictions still in place.
Kei Nishikori has set his sights on making a grand slam breakthrough in 2017 after the Japanese world number five concluded a successful season in which he claimed one ATP Tour title, an Olympic medal and recorded a career-high 58 wins.
The decision by the 36-year-old Swiss, who was stunned in the final of last year's Rogers Cup in Montreal by German Alexander Zverev, comes less than two weeks after his quarter-final loss at Wimbledon.
Roger Ferdrer came up with a solid all-round display to beat world No 1 Rafael Nadal 6-4, 6-3 in the final and win the Shanghai Masters on Sunday.
World number two Murray, who smashed a frame in anger in the final game, said the proximity of next week's Davis Cup final on a claycourt in Ghent had not been a factor in his defeat.
Gunning for a record seventh appearance at the Olympics this year, one more milestone beckons veteran Indian tennis star Leander Paes which is a testament to his longevity on the professional circuit. If the 42-year-old veteran manages to win 11 more matches on the ATP doubles tour this season, he will displace American Sherwood Stewart in the list of players with most number of doubles wins. Stewart is sitting sixth in the table with 728 wins while Paes, a winner of 17 Grand Slam titles, has taken his number to 718 after reaching the third round of the ongoing French Open in Paris. These staggering statistics do not include Paes' victories in the mixed doubles event and the ones on the ATP Challenger Tour. Last year when Paes recorded his last win of the season, he overtook Sweden's Jonas Bjorkman (712), ending 2015 with 713 wins.
'I've never been of the thought that Rafa needs rhythm because he's too good for that. But now the situation is different.'
Davis Cup: Ramkumar to lead Indian challenge against Pakistan on grass courts
Canada's world number three Milos Raonic has parted ways with coach Carlos Moya after the Spaniard guided the big-serving right-hander through his best season on the circuit. The 1998 French Open winner joined Raonic's coaching team in January and helped the 25-year-old reach his first grand slam final at Wimbledon and finish the campaign at a career-high ranking, rising 11 places since the end of 2015.
With the Davis Cup final against France looming, Roger Federer and his Swiss team mate Stanislas Wawrinka on Tuesday played down talk of an internal row, sparked by the pair's fiery clash at the ATP World Tour Finals last week.
Tsitsipas had lost all five previous matches against the Russian, but turned the tables in impressive fashion.
The marquee clash between a vintage Roger Federer and classy Rafael Nadal, the legends of the game will be awaited keenly by the fans as the third leg of the International Premier Tennis League (IPTL) in New Delhi on Friday.
Roger Federer claimed an eighth Swiss Indoor title when he outlasted Argentina's Juan Martin del Potro 6-7(5), 6-4, 6-3 in front of a partisan Basel crowd on Sunday.
A summary of sports events and sports persons, who made news on Monday
Argentina's Diego Schwartzman ended a two-year wait for his second ATP tour title as he overpowered an exhausted Fernando Verdasco to win the Rio Open 6-2, 6-3 on Sunday.
American twins Bob and Mike Bryan added another accolade to their lengthy resume after taking the Shanghai Masters men's doubles title on Sunday to become the first pair to win all nine ATP World Tour Masters 1000 tournaments.
Rohan Bopanna revealed that he will bring curtains down on his Davis Cup career when the country hosts Morocco in September
Rohan Bopanna and his partner Aisam-ul-Haq Qureshi have advanced to the semi-finals of the ATP Tour event in Casablanca, Morocco after scoring an easy straight-set win over Simon Greul and Peter Luczak.
Rohan Bopanna and Aisam-ul Haq Qureshi advanced to the semi-finals of the ATP Tour event in Casablanca, Morocco, after a straight sets win over Simon Greul and Peter Luczak. The Indo-Pak pair beat the German-Australian pair 6-3, 6-2 in the quarter-finals of the euro 450,000 clay-court tournament.
Unseeded Australian Daria Gavrilova upset fifth seed Petra Kvitova, of the Czech Republic, 6-2, 6-1 in the first round of the China Open on Saturday as Serbia's Aleksandra Krunic showed stunning powers of recovery to pull off her own shock win over sixth seed Elina Svitolina.
The former world number two, Alexander Zverev has repeatedly rejected the claims by his former girlfriend Brenda Patea that she was a victim of bodily harm during an argument in 2020, his lawyers have said.
Roger Federer began his pursuit for a sixth Swiss Indoors Basel title with an explosive 47-minute 6-2, 6-1 victory over Gilles Muller on Wednesday after Rafael Nadal reached the quarter-final with a 6-1, 6-1 win against Pierre-Hugues Herbert.
Andujar, ranked 75th in the world, made a strong start, while Federer struggled to settle into his serving rhythm early on.
It will be the second consecutive final for Paes and Angel, who also reached the final at Montrrey Challenger last week, ending runners-up to Jeevan Nedunchezhiyan and Marcelo Arevalo.
World number three and defending champion Roger Federer suffered a surprise defeat in the second round of the Shangahi Masters on Tuesday, losing 7-6(4), 2-6, 6-3 to Spain's Albert Ramos-Vinolas.
As the new World No 1, Andy Murray could be troubled by the weight of expectations on his shoulders at the ATP World Tour Finals, but the Briton just wants to enjoy his new status.
Andy Murray is performing a delicate balancing act as he prepares for a claycourt Davis Cup final and the ATP World Tour Finals on an indoor hardcourt at the O2 Arena.
Novak Djokovic and Roger Federer notched up contrasting victories to reach the Shanghai Masters quarter-finals on Thursday while David Ferrer fought back from a set down to knock out Andy Murray.
Former doubles world No. 1 Leander Paes was recently elected to receive the Ultimate Honour in Tennis - induction into the International Tennis Hall of Fame - as the Class of 2024.
World number two Novak Djokovic has appointed six-time grand slam winner Boris Becker as his head coach, the Serbian announced on Wednesday.
"Regrettably, I've decided not to participate in the French Open," Federer said on his Facebook page on Monday.
'The ability for players of any nationality to enter tournaments based on merit, and without discrimination, is fundamental to our Tour.'