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.
Alcaraz off to winning start at ATP Finals with win over De Minaur
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.
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.
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.
Novak Djokovic has almost fully recovered from the injury that ended his Australian Open campaign in the semi-finals.
Novak Djokovic is bidding to become only the third man in history to win 100 ATP titles.
American tennis great Jimmy Connors has put his hand up for one of the toughest coaching assignments in the world by offering to mentor Australia's wayward talent Nick Kyrgios.
The 25-year-old American, who linked up with the eight-times Grand Slam champion in July 2006, said their coaching agreement was terminated mutually.
Sinner, Alcaraz will keep tennis' flag flying: Shastri
Andy Roddick named former world number one Jimmy Connors as his new coach on Monday.
Djokovic has spent more than 400 weeks at number one and now sits fifth in the rankings
The Swiss equalled Jimmy Connors' 30-year-old record of 160 consecutive weeks as world number one.
Russian tennis player Maria Sharapova has reportedly decided to end her relationship with new coach Jimmy Connors, after losing to American Sloane Stephens in the second round of the Western & Southern Open at Cincinnati.
World number two Maria Sharapova, a stunning second-round loser at Wimbledon last month, has taken on eight-time Grand Slam winner Jimmy Connors as her new coach.
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.
A scientist from Northwestern University in Illinois has claimed to have solved the debate over who is the best male tennis player of all time.
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.
'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.'
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
Novak Djokovic said he has recovered from the hamstring injury that forced him out of the Australian Open semi-finals
Maria Sharapova has confirmed she has severed ties with coach Jimmy Connors after one match together. The Russian world number three said in a statement e-mailed to Tennis.com that the pairing had not been 'the right fit for this time in my career'.
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.
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.
Daniil Medvedev has tapped into the energy of the crowd at Melbourne Park by playing both hero and villain.
Jannik Sinner defeated Carlos Alcaraz in a high-octane final to claim his maiden Wimbledon trophy and fourth Grand Slam crown on Sunday.
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.
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's bid for a 100th ATP Tour title gained momentum on Thursday
Djokovic looked in fine nick in Shanghai, playing with consistency throughout the tournament to reach his fifth final at the ATP Masters 1000 event
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
The Maria Sharapova-Jimmy Connors partnership got off to a rocky start on Tuesday as Sloane Stephens shocked the third ranked Russian 2-6, 7-6(5), 6-3 at the Western and Southern Open.
'It's one of the most epic matches I have played on this court, on any court really.'
Djokovic etched his name in history by clinching a record 24 Grand Slam titles