Italy's Sinner and Spain's Alcaraz have won two Grand Slams each this year, with Alcaraz beating Sinner in closely fought clashes at the French Open semi-finals and the China Open final.
Sinner remains the man to beat at Melbourne Park even as doping officials seek a two-year ban for the world number one for failing two drugs tests last March.
Third seed Alexander Zverev eased past home favourite Ugo Humbert
AITA President Anil Jain, who was accused of using his position for personal gains, avoided facing a no-confidence motion from the state associations only after he agreed to step aside.
Former world number one Novak Djokovic, the last surviving member of tennis' "Big Four", said he does not plan on stopping any time soon but admitted that the retirement of rivals Roger Federer, Andy Murray and Rafa Nadal has been overwhelming.
The Serb easily beat the Spaniard 6-3, 6-4 at the O2 Arena.
Daniil Medvedev destroyed his racket and a net camera in a mid-match meltdown as he survived a huge scare against Thai wildcard Kasidit Samrej.
Japan's Kei Nishikori surged to a three-set victory over alternate David Ferrer at the ATP World Tour Finals on Thursday before sitting back to watch his fate unfold in the night match.
Former world number three Nikolay Davydenko announced his retirement on Thursday at the age of 33.
The Swiss star underwent arthroscopic right knee surgeries in February 2020 and May 2020. Federer has played five tournaments since having those surgeries, all of which came this season.
Roger Federer wants more blood testing done in tennis to help keep the sport clear of doping, the 17-time Grand Slam champion said on the eve of the ATP World Tour Finals.
The All India Tennis Association (AITA) selection panel picked a five-member squad in which Mukund will be the highest-ranked singles player at number 368.
Frenchman Julien Benneteau caused a stir during an interview on French radio station RMC Sport on Sunday in which he said tournament referees were often kinder to Federer when it came to scheduling his matches.
Indian Davis Cupper Rohan Bopanna dropped out of the top-10 in the ATP doubles ranking after finishing last along with Pakistani partner Aisam-ul-haq Qureshi in group B of the season-ending finale in London.
Briton Andy Murray will take over from Novak Djokovic as World No 1 when the rankings are updated on Monday after his Paris Masters semi-final opponent Milos Raonic withdrew with a leg injury on Saturday.
Yuki Bhambri and his Dutch partner Robin Hasse went down in straight sets to Ivan Dodig and Austin Krajicek at the Dubai Duty Free Tennis Championships.
World No 1 Rafael Nadal, who is hoping to recover from a knee injury to play in the season-ending showpiece, heads the other group and will face Belgian David Goffin, Bulgarian debutant Grigor Dimitrov and Austrian Dominic Thiem.
Britain's Jamie Murray and Brazil's Bruno Soares will end the year as the top-ranked doubles duo after French pair Nicolas Mahut and Pierre-Hugues Herbert lost at the ATP World Tour Finals on Friday.
Roger Federer's decision to withdraw means Switzerland can no longer take part in the nation-based event on January 3-12
World number six Milos Raonic has withdrawn from the French Open having failed to recover from a foot injury, the 24-year-old announced on Thursday.
Team Europe and Team World are tied at 2 after one day of the Laver Cup after play opened Friday in Berlin.
Leander Paes might team up with Ramkumar Ramnathan instead of Sumit Nagal in this month's Asian Games after captain Zeeshan Ali said he will consider the ATP World Tour finalist's request to pair up with the senior pro.
Roger Federer produced another masterly display to beat Japan's Kei Nishikori 6-3 6-2 and move a step closer to the semi-finals at the ATP World Tour Finals in London on Tuesday.
American Jack Sock clinched the last spot in the ATP Tour finals when he beat Serbian qualifier 5-7, 6-4, 6-1 to win the Paris Masters title on Sunday.
The winner of 11 ATP World Tour doubles titles, Poles Marcin Matkowski and Mariusz Fyrstenberg were off to a great start with a 6-3, 7-6 (3) victory over Indo-Czech duo of Leander Paes and Lukas Dlouhy at the opening day Round Robin match at the 2010 World Tour Finals in London on Sunday.
The prestigious end-of-season Masters Cup will switch from Shanghai to London from 2009, the ATP men's tennis tour announced on Tuesday.
Friction has dogged the ATP Player Council, whose president is world number one Novak Djokovic, this year since ATP president Chris Kermode failed to gain support for another term.
The two cases shocked the tennis world with many fuming at how they were handled by the authorities.
It has now come to light that Federer's wife Mirka is at the centre of this now infamous row between the seventeen-time Grand Slam champion and the 2014 Australian Open champion.
Leander Paes and his partner Lukas Dlouhy rounded off their disappointing campaign at the season ending World Tour Finals with their third successive defeat in London on Friday.
Rohan Bopanna and his Australian partner Matthew Ebden sailed into the men's doubles final at the Miami Open.
The Serbian Wimbledon champion extended his win streak to nine, wrapping up the final in 75 minutes without facing a break point and booked his place at next month's ATP Finals.
The first player to win a Grand Slam, the ATP World Tour Finals, the men's singles at the Olympic Games and a Masters title in the same calendar year.
Roger Federer called for a merger between the two governing bodies last month, with both Simon and ATP Tour Chairman Andrea Gaudenzi welcoming the suggestion. But some top WTA players have said they want an equal standing for the women players in a combined body.
Here is a quick glance of all the highs and lows from Nadal's stupendous career:
Canada's Milos Raonic boosted his chances of qualifying for the lucrative ATP World Tour Finals after capturing his first title of the season with a 6-3, 3-6, 6-3 win over Portugal's Joao Sousa in the final of the St. Petersburg Open on Sunday.
Novak Djokovic claimed his third ATP World Tour title in a perfect season by beating top-seeded Spaniard Rafa Nadal 4-6, 6-3, 6-2 in the final of the Indian Wells ATP tournament on Sunday.
ATP events in Hamburg, Bastad, Newport, Los Cabos, Gstaad, Umag, Atlanta and Kitzbuhel will not go ahead as scheduled.
Following is a list of the previous matches between Switzerland's Roger Federer and Spain's Rafael Nadal ahead of their meeting in the title decider at the Australian Open on Sunday
Australian Open chief Craig Tiley believes any Saudi Arabian investment in tennis would not have the same impact as in golf.