Djokovic did not do much wrong as he battled Sinner and the crowd - regularly jesting with the fans who jeered him throughout the duel.
Here is a compilation of some of the best photos from 2021...
World No 1 Carlos Alcaraz fended off in-form American Tommy Paul to reach the Cincinnati Open quarter-finals on Thursday
The Spaniard needed less than 90 minutes to dispatch the 23rd seed from Italy
Federer may never glide across it as only he can, or any other Grand Slam court for that matter, again. But his legacy will never fade.
'During the grass court season, I unfortunately experienced a setback with my knee, and have accepted that I must withdraw from the Tokyo Olympic Games.'
A round-up of all the tennis action from around the globe.
Daniil Medvedev was knocked out in the fourth round of Indian Wells by Bulgarian Grigor Dimitrov on Wednesday as the world number two's near-flawless start turned nightmarish in a 4-6, 6-4, 6-3 defeat.
Roberto Bautista Agut predicted a great future for Jannik Sinner after going down to the Italian teenager
Alcaraz outlasts Hurkacz, Ruud stunned at Canadian Open
Defending champion Stefanos Tsitsipas came out on top from a thrilling quarter-final clash with Diego Schwartzman, prevailing 6-2, 6-7(3), 6-4 on Friday to set up a meeting with Alexander Zverev at the Monte Carlo Masters.
The 'Big Three' of men's tennis have found some "fresh energy" to thwart the charge of younger players on the tour, world number one Novak Djokovic said after setting up yet another title clash against his biggest rival against Rafael Nadal.
Earlier, title holder Borna Coric beat American Sebastian Korda 7-6 (5), 6-4, while another home hope Taylor Fritz survived a first-set thriller to beat Czech Jiri Lehecka 7-6 (14), 6-2.
In the women's draw, Angelique Kerber was knocked out in a 6-3, 6-1 defeat to Czech Katerina Siniakova while Coco Gauf won her first ever match on clay.
Images from Day 5 of the 2023 Australian Open at Melbourne Park on Friday.
Novak Djokovic continues his hunt for a fifth straight Wimbledon title and eighth overall to equal Roger Federer's record haul when the Serbian meets Jannik Sinner.
A look at Roger Federer's worst five Grand Slam losses.
Claycourt master Rafael Nadal quickly adapted to his new surroundings at Roland Garros with a 6-2, 6-1, 6-3 demolition of German qualifier Yannick Hanfmann in the first round of the French Open on Monday.
'My arm has been -- I have had an issue there for quite a while now. It has gotten bigger in the last couple of weeks, so I'm just trying to protect it.'
World number three Roger Federer is playing his first tournament on clay for three years as he prepares for the French Open.
IMAGES from Day 9 of the French Open at Roland Garros in Paris on Monday.
World number one Ash Barty delighted the Memorial Drive crowd by breezing through to the Adelaide International semi-finals with a comfortable 6-3, 6-4 victory over Sofia Kenin on Friday.
Nadal has won the Australian and the French Open back-to-back and has the chance to become the first man to win all four majors in the same year
Roger Federer was made to work hard by Fernando Verdasco before beating the Spanish veteran 6-3, 3-6, 6-3 on Wednesday to reach the quarter-finals of the Dubai Duty Free Tennis Championships.
Muguruza wins all-Spanish clash with Badosa at WTA Finals
20-time Grand Slam champion Roger Federer returned from more than a year away for a last dance in tandem with great rival Rafael Nadal on a gripping and memorable finale by the Thames in front of a 17,500 sell-out crowd at London's O2 Arena on Friday.
Alexander Zverev overcame late nerves to beat world number one Novak Djokovic on Saturday and set up a final showdown with Daniil Medvedev at the ATP Finals.
Jabeur advances to first WTA 100 final in Madrid in style.
World number one Novak Djokovic produced a majestic display in a 7-5, 6-3 victory over American John Isner on Thursday to extend his winning streak in Asia.
The unseeded Indo-Canadian pair defeated their fancied rivals 6-3, 3-6, 10-5 in a round of 16 tie of the ATP Masters 1000 event.
Raducanu retires in Rome as back injury persists, Jabeur survives early scare
World number one Novak Djokovic extended his winning run in Asia when he strolled into the last-16 of the Shanghai Masters.
'I am realistic, don't get me wrong, I know how difficult it is at this age right now to do another surgery and try it, but look, I want to be healthy and I'll go through the rehab process I think also with the goal while I am still active which I think is going to help me during this long period of time.'
World number one Carlos Alcaraz retired injured against Holger Rune at the Paris Masters on Friday, sending his fellow 19-year-old through to the semi-finals, while Novak Djokovic and Felix Auger-Aliassime also sealed places in the last four.
Three-times winner Serena Williams moved into the Toronto Open second round after beating Spain's Nuria Parrizas Diaz on Monday
Novak Djokovic enjoyed a stress-free return to US competition following a two year absence
A round-up of all tennis action on Saturday.
IMAGES from the matches played on Day 10 of the BNP Paribas Open at Indian Wells, California, on Wednesday
IMAGES from matches on Day 4 of the US Open at Flushing Meadows in New York on Thursday.
Rafael Nadal overcame a temporary blip on his way to victory at the ATP Cup on Saturday
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