Novak Djokovic said the pursuit of Olympic gold left him without much in the tank for his US Open title defence.
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.
Former world number one Novak Djokovic, the last surviving member of tennis' "Big Four", said he does not plan on stopping any time soon but admitted that the retirement of rivals Roger Federer, Andy Murray and Rafa Nadal has been overwhelming.
Spain's World Cup winning midfielder Aitana Bonmati was named the Sportswoman of the Year, while Serbia's Novak Djokovic captured the top men's honour at the Laureus awards ceremony on Monday.
Serb Novak Djokovic moved relentlessly into the Indian Wells semi-finals on Friday, setting up a mouth-watering clash in the last four with Roger Federer for the Swiss world number two's ranking.
Top seed Serb Novak Djokovic brushed aside German Florian Mayer on Saturday to set up a final clash with Jo-Wilfried Tsonga in the China Open.
Seven-times champion Novak Djokovic produced some of his best tennis to outclass Italian 25th seed Lorenzo Musetti 6-4, 7-6(2), 6-4 on Friday and reach a 10th Wimbledon final on Friday.
Novak Djokovic injured his right knee during his fourth-round win at the French Open and pulled out of the quarter-finals before having surgery on June 6.
The Wimbledon men's singles semi-finals take centre stage at the All England Club on Friday.
Novak Djokovic said he is building up to hit top form for his French Open title defence.
Zverev fresh for Australian Open final after being spared gruelling Djokovic test
The International Tennis Federation (ITF) named Novak Djokovic and Aryna Sabalenka as its 'world champions' of 2023 after their performances at this year's Grand Slams.
Novak Djokovic, chasing a record 23rd Grand Slam title, has said he was not holding back and would do it again. He is set to play his second-round match later on Wednesday against Hungary's Marton Fucsovics.
The 35-year-old Serb was sent home from Australia on the eve of last year's event after a row about his COVID-19 vaccination status.
Although they registered contrasting wins, Serbian tennis stars Novak Djokovic and Jelena Jankovic marked a good day for Serbs at the BNP Paribas Open in Indian Wells on Tuesday.
Rafael Nadal reached the Wimbledon final after Serb Novak Djokovic retired hurt with the Spaniard leading their semi-final 3-6, 6-1, 4-1.
As he continues to live his dream, Novak Djokovic is also staking his claim to the mantle of greatest tennis player of all time.
Djokovic says young rivals have awoken his inner 'beast'
Australian great Rod Laver says engravers should get to work putting the world number one's name on the Grand Slam trophy for an 11th time.
World No 1 Novak Djokovic was beaten by Tomas Machac in the Geneva Open semi-finals.
Novak Djokovic dug out a 6-7(4) 6-1 6-4 win over Czech Jakub Mensik on Friday to advance to the semi-finals of the Shanghai Masters, where he will face Taylor Fritz.
He may have entered the semifinal as the underdog, but Jannik Sinner's stunning victory over overwhelming favourite Novak Djokovic left the Melbourne crowd shocked.
ITF said that Novak Djokovic's statement at the French Open did not break any rules.
World number one Novak Djokovic will be able to compete at the US Open this year after the US government said on Monday it will end its COVID-19 vaccination requirements.
Alcaraz will hope to bury memories of an injury-plagued start to last year when he missed the Australian Open
Novak Djokovic hampered by wrist issue at United Cup
Defending champion Jannik Sinner and Carlos Alcaraz are aiming for a third successive Grand Slam final meeting when they take their high-voltage rivalry to the US Open while Novak Djokovic looks to foil the new generation as he hunts a 25th major.
Serbia's Novak Djokovic beat Italy's Lorenzo Musetti 6-4 6-2 to reach his first Olympic final on Friday and will bid for gold in a blockbuster clash with Carlos Alcaraz.
Djokovic's official website also confirmed his participation in the Dubai tournament.
Novak Djokovic reached the semi-finals of the Australian Open on Wednesday after Kei Nishikori retired hurt when trailing 6-1, 4-1 in their quarter-final.
Daniil Medvedev, the 2021 champion, will need to shake off a run of poor form if he is to mount a challenge.
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 following are five contenders for the men's title at Wimbledon, which begins on Monday.
'That's something that you don't see very often because the wounds of the war are still fresh and we are very happy with the way these people showed their support. They fully deserve to have this event'
IMAGES from Day 4 of the Wimbledon Championships, at the All England Lawn Tennis and Croquet Club, London, on Thursday.
Novak Djokovic claimed a record-breaking 23rd men's singles Grand Slam title when he beat Norway's Casper Ruud 7-6(1) 6-3 7-5 in the French Open final.
'I'm not going to overplay. I'm not going to do anything different because I'm playing Novak. I'm going to play my game, play within myself and trust that if I play well, it's enough.' - US Open
Djokovic spent much of the third-round encounter cruising on auto-pilot
Djokovic said his son had won his first tournament on the same day he won the Italian Open
World number one Novak Djokovic is considering going without a coach after 20 years in professional tennis, the Serb said after receiving the top men's honour at the Laureus awards.