The 38-year-old said he had been dealing with the injury throughout the tournament in Athens.
Defending champion Jannik Sinner reached the semi-finals of the ATP Finals with a 6-4, 6-3 win over two-times winner Alexander Zverev on Wednesday, with Ben Shelton eliminated after losing earlier to Felix Auger-Aliassime in the same group.
Shelton was broken in the opening and closing games of the first set, unable to take advantage of a break point at 2-1 down while Sinner was always capable of pulling out an ace at the crucial time, hitting two in that fourth game to hold serve.
Alcaraz off to winning start at ATP Finals with win over De Minaur
World No. 1 Carlos Alcaraz came under extreme pressure before overcoming American Taylor Fritz 6-7(2), 7-5, 6-3 in a thrilling round-robin match at the ATP Finals on Tuesday, leaving the Spaniard on two wins from two.
Women's World No. 1 Aryna Sabalenka will take on Australian maverick Nick Kyrgios in a 'Battle of the Sexes' exhibition match in Dubai on December 28, organisers announced on Tuesday.
Jannik Sinner began his bid to retain the ATP Finals title with a resounding 7-5, 6-1 win over injury-hit Canadian Felix Auger-Aliassime in their round-robin clash.
Jannik Sinner and Carlos Alcaraz are poised to reignite their rivalry at the ATP Finals, with the year-ending championship that begins on Sunday expected to produce another title showdown between the pair in a season that has belonged to them.
Carlos Alcaraz began his bid for a first ATP Finals trophy with a win over Alex de Minaur and Alexander Zverev overpowered Ben Shelton in their round-robin openers.
Canada's Felix Auger-Aliassime reached the last four of the ATP Finals with a 6-4, 7-6(4) round-robin win over two-times winner Alexander Zverev on Friday and Jannik Sinner extended his indoor hardcourt unbeaten run by beating American Ben Shelton.
Canadian Open champion Shelton was locked in an entertaining contest with Frenchman Adrian Mannarino in the day's opening match on Louis Armstrong Stadium when his tournament suddenly unravelled.
Novak Djokovic is bidding to become only the third man in history to win 100 ATP titles.
Novak Djokovic's battling victory under the lights of Arthur Ashe Stadium made him the oldest man to reach the last 16 at the US Open.
Novak Djokovic battled from a set down to clinch his 100th tour-level title by beating Polish sixth seed Hubert Hurkacz 5-7, 7-6(2), 7-6(2) at the Geneva Open on Saturday.
Novak Djokovic has almost fully recovered from the injury that ended his Australian Open campaign in the semi-finals.
'It's a different surface and I've not had much time to get used to this tournament so my expectations aren't that high.'
Djokovic has spent more than 400 weeks at number one and now sits fifth in the rankings
Novak Djokovic fell short in his bid to claim a 100th ATP title following a straight sets defeat by Czech teenager Jakub Mensik in the Miami Open final
Jannik Sinner defeated Carlos Alcaraz in a high-octane final to claim his maiden Wimbledon trophy and fourth Grand Slam crown on Sunday.
Novak Djokovic said he has recovered from the hamstring injury that forced him out of the Australian Open semi-finals
Novak Djokovic is one win away from a 100th career singles title after breezing past Grigor Dimitrov 6-2, 6-3 on Friday to reach the Miami Open final, where he will face either third seed Taylor Fritz or rising Czech Jakub Mensik.
The 19-year-old Czech Jakub Mensik beat his childhood idol Novak Djokovic in the Miami Open final in an upset for the ages on Sunday.
Sinner, Alcaraz will keep tennis' flag flying: Shastri
Novak Djokovic's bid for a 100th ATP Tour title gained momentum on Thursday
Novak Djokovic's bid to add a 100th singles title to his trophy cabinet on Sunday was dashed after he was beaten 7-6(4), 6-3 by world number one Jannik Sinner in the Shanghai Masters final on Sunday.
Djokovic saved three breakpoints in stifling conditions to go 5-4 up but lost the opening set in a tough tiebreak as Opelka cranked up his serve
Djokovic looked in fine nick in Shanghai, playing with consistency throughout the tournament to reach his fifth final at the ATP Masters 1000 event
'It's one of the most epic matches I have played on this court, on any court really.'
Jannik Sinner will hope to block out a rocking home crowd on Sunday when he faces Taylor Fritz in the US Open final at Flushing Meadows, where the 12th seed will be bidding to become the first American man in 21 years to win a Grand Slam singles title.
Djokovic etched his name in history by clinching a record 24 Grand Slam titles
Daniil Medvedev has tapped into the energy of the crowd at Melbourne Park by playing both hero and villain.
Novak Djokovic's bid for a record 25th Grand Slam title kicked off on Monday with an easy win over qualifier Radu Albot in the US Open first round.
Djokovic's sixth trophy this season helped him to extend his lead over the second-ranked Carlos Alcaraz in the race to the year-end number one spot
Former US Open champion Stan Wawrinka said he still had the game for the grandest stage after the Swiss veteran became the oldest man to win a singles contest at the tournament since a 40-year-old Jimmy Connors in 1992.
Victory over Medvedev meant Alcaraz became the youngest man to win the Indian Wells and Miami Open titles, a feat dubbed the 'Sunshine Double'.
Tennis great Chris Evert has hit out at her former fiance Jimmy Connors for hinting that their relationship ended in the 1970s after she had an abortion against his wishes.
'I think in 2009 I questioned it for the first time. (It has been) 10 years and here I am. I'm exactly where I wanted to be at this age'
'The Laver Cup next week in London will be my final ATP event. I will play more tennis in the future, of course, but just not in Grand Slams or on the tour.'
He received the honour from Diaz Ayuso, the President of the Community of Madrid.
Fritz delivers as US win inaugural United Cup crown
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