The 38-year-old said he had been dealing with the injury throughout the tournament in Athens.
Jannik Sinner beat Felix Auger-Aliassime to win the Paris Masters for the first time on Sunday.
The World No 1, who extended his hardcourt winning streak to 26 matches, will play against Canada's Felix Auger-Aliassime in the semi-finals.
Felix has gone past the opening round of a major for the first time since the 2023 Australian Open.
Manchester City's Erling Haaland extended his remarkable scoring streak to 12 straight matches as his side recorded a comfortable 2-0 victory at Villarreal in the Champions League on Tuesday.
A round-up of Tuesday's action in the UEFA Champions League.
Djokovic to face World number 204 Valentin Vacherot next.
After a gutsy performance that pushed Sinner to four sets, the Italian world number one ultimately proved too strong. Yet the Canadian said he would carry plenty of positives forward from Flushing Meadows.
Medvedev in Shanghai semis as Rinderknech joins cousin Vacherot in last four
Barcelona's Joao Felix scored in the first half to secure a hard-fought 1-0 home win against his valiant parent club Atletico Madrid in a compelling LaLiga clash on Sunday.
Defending US Open champion Jannik Sinner continued his stellar run at the hardcourt Grand Slams with a 6-1, 6-1, 6-1 hammering of Kazakh 23rd seed Alexander Bublik on Monday to make the quarter-finals at Flushing Meadows.
Defending champion Jannik Sinner swept past Felix Auger-Aliassime 6-0, 6-2 on Thursday to reach the Cincinnati Open semi-finals, the world number one extending his hardcourt winning streak to 25 matches.
Kylian Mbappe scored twice from the penalty spot as Real Madrid fought back from a goal down to beat Olympique de Marseille 2-1 in their opening match of the Champions League group stage, at the Santiago Bernabeu, Madrid, on Tuesday.
Alexander Zverev's Grand Slam experience proved decisive as the German third seed defeated Briton Jacob Fearnley 6-4 6-4 6-4 in the U.S. Open second round on Thursday
Images from the US Open matches played at Flushing Meadows on Saturday
IMAGES from the UEFA Champions League matches played on Wednesday
Jannik Sinner had to dig deep to get the better of Auger-Aliassime in the second semi-final.
Images from the Club World Cup match between Borussia Dortmund and Mamelodi Sundowns at TQL Stadium, Cincinnati, Ohio, on Saturday.
Carlos Alcaraz, who advanced to the last eight in Cincinnati for the third time, has now won 36 of his last 38 matches.
Chelsea's Joao Felix endured a nightmare debut when he was sent off in a 2-1 Premier League defeat at local rivals Fulham.
It was third time lucky for Tsitsipas who had twice lost in the Dubai final, against Roger Federer in 2019 and Novak Djokovic a year later.
Zverev and Shelton tested each other in a high-quality encounter before the world number three played a near flawless tiebreak to clinch the match in little over two hours and stretch his career win-loss record over the American to 3-0.
Jannik Sinner's bid to win back-to-back Halle Open titles was ended on Thursday
Andrey Rublev reached the final of the Qatar Open on Friday with a 7-5, 4-6, 7-6(5) win over Canada's Felix Auger-Aliassime, and will meet Jack Draper in the decider after the Briton beat Czech Jiri Lehecka.
Widely expected to contend in Saturday's 4x400m relay final, Felix would break Carl Lewis's American medal record if she reaches the podium yet again at her fifth and final Games, a prospect Lewis appeared to welcome.
Carlos Alcaraz got his grasscourt campaign up and running with a 6-4, 7-6(4) victory over Australian Adam Walton
Record signing Joao Felix scored two first-half goals for Atletico Madrid as they secured a 2-1 win over Juventus in the International Champions Cup.
Safiullin upsets Muller, Moutet through in Mallorca
A round-up of Saturday's action in LaLiga, Serie A and Ligue 1.
Zlatan Ibrahimovic pulled up at the end of the session, possibly with a calf muscle problem. Atletico Madrid's record signing Joao Felix is likely to miss the start of the Spanish soccer season when it resumes next month after sustaining a sprained knee in training.
Tallon Griekspoor staged a grand recovery, saving four match-points, before stunning top seed Daniil Medvedev 2-6, 7-6(7), 7-5 to reach the semi-finals of the Dubai Championships on Thursday.
Zverev cruised past home favorite Roberto Bautista Agut 6-2, 6-2, while Sabalenka triumphed over qualifier Anna Blinkova 6-3, 6-4.
Lehecka struck eight aces and converted four of eight break chances to secure the first Top 3 win of his career.
Top seed Carlos Alcaraz withstood a charge from qualifier Luca Nardi for a 6-1, 4-6, 6-3 victory in the second round of the Qatar ExxonMobil Open in Doha on Wednesday.
'Everyone with a low BMI will not get Type 5 diabetes.'
Madison Keys was dumped out of the Miami Open third round on Sunday, falling 6-4, 6-2 to Philippine wild card Alexandra Eala
Villarreal fought back to shock Barcelona 3-2 on Sunday, handing the LaLiga champions their first league defeat since late December.
Fonseca cruised through the first set before Fearnley found his groove in the second to level the match on a windy day in the California desert.
Novak Djokovic was stunned 7-6(4), 6-2 by Matteo Berrettini in the Qatar Open first round on Tuesday as the Italian enjoyed his first win over the former world number one.
A summary of Tuesday's action in the UEFA Champions League Knock-out Phase play-offs.
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