The 38-year-old said he had been dealing with the injury throughout the tournament in Athens.
Petr Bar Biryukov defeated Ilya Ivashka to win the men's singles title at the SM Krishna Memorial Open. Adil Kalyanpur and Mukund Sasikumar won the doubles title.
Richard Gasquet kept his ATP World Tour finals hopes alive when he overcame Fernando Verdasco 7-5, 6-7(6), 6-3 to reach the Paris Masters third round as fellow Frenchman Jo-Wilfried Tsonga crashed out of the race on Tuesday.
However, the 33-year-old Spaniard will not know until later on Friday whether his Herculean effort was in vain.
Jannik Sinner defeated Rafael Jodar in the Madrid Open quarter-finals, securing his spot in the semi-finals and becoming the sixth player to reach the semi-finals of all nine ATP 1000 Masters tournaments.
Leander Paes's dream of winning ATP year-end finals remained unfulfilled as the veteran Indian crashed out of the prestigious event along with Czech partner Radek Stepanek after losing a must-win Group B match in London.
Even though he withdrew from his semi-final tie with Denis Shapovalov, Nadal's run to the last four in Paris saw him reclaim the number one spot from Novak Djokovic on Monday.
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.
World number one pair Henry Patten and Harri Heliovaara successfully defended their Wimbledon men's doubles title, defeating Mate Pavic and Marcelo Arevalo in two tie-break sets. This marks their second Wimbledon victory and third major title together, highlighting their dominance in men's doubles.
It took a while, but Rafael Nadal finally showed up at the ATP's end-of-year fiesta on Monday when he lit up the second day of the World Tour Finals with a compelling round robin victory against Andy Roddick.
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.
Blockx converts late Madrid call-up into breakthrough semi-final run even as Zeverev joins Federer, Nadal in elite list.
Stefanos Tsitsipas' struggles continue with a first-round exit in Munich, as injuries and inconsistent form see his ranking drop to its lowest in eight years.
Sweden's Robin Soderling will replace Andy Roddick in the ATP World Tour finals after the American pulled out with a knee injury on Tuesday.
London's stunning 02 Arena will stage the ATP World Tour Finals for the seventh year in succession in 2015 but that will already be four too many, defending champion Novak Djokovic said on Monday.
Wimbledon begins June 29 with Serena Williams returning after four years, Novak Djokovic chasing a 25th Slam, and a reshaped field after Carlos Alcaraz's injury.
The victory saw him move up by three places to stand only behind Spain's Rafael Nadal and Swiss star Roger Federer.
Rafael Nadal refused to let a good old-fashioned beating at the hands of fierce rival Novak Djokovic on Monday take the gloss off a sensational year.
Novak Djokovic handed Kei Nishikori a brutal lesson in hardcourt tennis as the Serb began his bid for a record fourth successive title at the ATP World Tour Finals with a 6-1, 6-1 win on Sunday.
One thing is beyond doubt after eight fabulous days of action at the ATP World Tour Finals -- tennis has found a spectacular new venue at London's space-age O2 Arena.
Matteo Berrettini reached the French Open quarterfinals by ousting giant-killer Juan Manuel Cerundolo, while Felix Auger-Aliassime and Flavio Cobolli sealed their last-eight spots with contrasting wins.
Taylor Fritz moved closer to the semis of the season-ending ATP Finals after the American beat Alex de Minaur 5-7 6-4 6-3 in their last group game on Thursday, but he will have to wait and see if Jannik Sinner can take a set off Daniil Medvedev.
For 15 minutes Novak Djokovic appeared to have a fight on his hands at the ATP World Tour Finals on Wednesday, then the Serb dialled up his A game and tore Stanislas Wawrinka to pieces.
Daniil Medvedev has called for a streamlined ATP calendar with only Grand Slams and Masters 1000 tournaments offering ranking points, though the Russian concedes such reforms would be difficult to implement.
Auger-Aliassime, now coached by Nadal's uncle and long-time mentor Toni who sat in his box, will face Fritz in his final group match with a chance of making the last four.
Jannik Sinner, the world number one, showcased his dominance by defeating Alexander Zverev in straight sets to win the Madrid Open, marking his fifth successive ATP Masters 1000 title.
Roger Federer booked his place in the ATP World Tour Finals for a record-tying 12th consecutive year when he dismissed South African Kevin Anderson 6-4, 6-4 to reach the third round of the Paris Masters on Wednesday.
A mouthwatering finale to the season ended before it even began on Sunday when Roger Federer was forced to pull out prior to the ATP World Tour Final showdown with Novak Djokovic.
World number eight Mirra Andreeva warmed up for the Australian Open with a comfortable 6-3, 6-1 victory over fellow teenager Victoria Mboko in the Adelaide International final on Saturday to claim her fourth WTA Tour title.
Dimitrov has enjoyed the best season of his career in 2017, clinching four titles overall, including his first Masters title in Cincinnati.
With world number four Ruud already assured of a semi-final berth the match was in reality a dead rubber.
Rafael Nadal's decision to end his season early means Cilic is actually holding the last berth for the eight-man showdown at London's O2 Arena.
Novak Djokovic said he is hoping to put the cherry on top of a successful 2023 season with a record seventh ATP Finals title, after the world number one beat Carlos Alcaraz in the semi-final to set up a showdown with Jannik Sinner.
Novak Djokovic's 6-3, 6-4 demolition of the top-ranked Spaniard in the ATP World Tour Finals made him only the seventh player to win the year-end championship at least three times. We take a look at the players who preceded the Serb to the feat.
The 45-year-old Bopanna's final appearance on the Tour came at the Paris Masters, where he partnered Kazakhstan's Alexander Bublik, losing in the opening round earlier this week.
World number one Roger Federer will face his US Open conqueror Juan Martin del Potro in the round-robin stage of the ATP Tour finals after getting the rough end of Wednesday's draw for the season finale. The Swiss, who is not guaranteed to end the year on top of the rankings, will also face Britain's Andy Murray and Spain's Fernando Verdasco in Group A at the eye-catching O2 Centre alongside the River Thames when play starts on Sunday.
Tumakuru, Karnataka, is set to host its first-ever ITF Women's World Tennis Tour W35 tournament, marking a significant moment for tennis in the region and offering a pathway for players to earn professional ranking points.
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.
Eighth seed Machac, who won gold in mixed doubles at the Paris Olympics, became the third player from his country to win an ATP 500 title, following Tomas Berdych and Radek Stepanek.
Grigor Dimitrov claimed the biggest title of his career and sent out a huge statement of intent as the stylish Bulgarian beat David Goffin 7-5, 4-6, 6-3 to win the ATP Finals.
