Roger Federer will make his return to the tennis circuit from a double knee surgery at an ATP 250 tournament in Qatar in March, having not played since last year's Australian Open.
Australian Open holder Djokovic will make his ATP Cup debut for Serbia against South Africa in Brisbane on Saturday while Nadal will lead Spain into action against Georgia in Perth on the same day.
Australia's Nick Kyrgios could find himself in hot water again after accusing men's tennis governing body ATP of being "corrupt" following his US Open first round victory.
World men's number one Jannik Sinner has been cleared of fault or negligence by an independent tribunal after failing two drug tests in March, the International Tennis Integrity Authority (ITIA) said on Tuesday.
Sumit Nagal was handed a straight-set defeat by Canada's Milos Raonic in the opening round of the BNP Paribas Open.
Nishikori is the latest high-profile men's player to pull out of the season's first Grand Slam following the withdrawal of Briton Andy Murray on Saturday.
The winners of the Serbia-Germany tie will join Spain, Russia and Italy in the semi-finals.
The ATP tour, which was suspended in March due to the novel coronavirus outbreak, is set restart on Aug. 14 with the Citi Open, followed by the Cincinnati Masters, which will be held at Flushing Meadows before the US Open.
India's Yuki Bhambri and his French partner Albano Olivetti crashed out of Marrakech Open after losing the hard-fought semifinal to second seeds Lucas Miedler and Alexander Erler of Austria.
The Serb set up the breakaway PTPA on the eve of the US Open in September and resigned as head of the player council but last month he confirmed that he had been nominated by his fellow professionals for the current elections which he accepted.
Jannik Sinner won his maiden Grand Slam title at the Australian Open on Sunday.
The hosts had blanked Germany in their opening tie and became the first to seal a quarter-final spot with their second 3-0 win in the inaugural team event.
When contacted, AITA Secretary General Anil Dhupar said he does not have any objection to Bopanna playing with Balaji, ranked 84, at the Paris Olympics.
The Bangalore Open scheduled to be held from September 29 has been suspended due to the local promoter's security concerns, according to the Association of Tennis Professionals (ATP) Board.
For the second consecutive Davis Cup tie, India are relying on doubles specialist N Sriram Balaji to do the singles duty
The 32-year-old debutant at the ATP's blue riband event won the first 11 games of the round-robin clash before a relieved Nishikori finally got on the scoreboard with an angled winner.
The duo made the men's doubles semi-finals at Wimbledon and the final of the US Open in the same season.
Australian top seed Alex de Minaur moved into his second consecutive final at the Next Gen ATP Finals with a 4-2, 4-1, 0-4, 4-2 victory over Frances Tiafoe in Milan on Friday.
Balaji also showed that he can quickly adapt to conditions when he was asked to do the singles duty during the Davis Cup tie against Pakistan on grass. The rival was not of the highest quality but Balaji showed that he was willing to come out of his comfort zone if the team demands.
Twenty four time Grand Slam champion Novak Djokovic closed the 2023 ATP season by clinching the year-end No. 1 spot for a record-extending eighth time.
Ace Indian tennis player Sumit Nagal was off to a winning start in Monte Carlo Masters as he defeated world number 63 Flavio Cobolli of Italy in straight sets in the qualifiers in Monte Carlo on Saturday.
Djokovic etched his name in history by clinching a record 24 Grand Slam titles
Federer was joined by his wife Mirka, who herself made a pretty picture in a black collared gown.
Top-ranked Iga Swiatek of Poland faces Irina-Camella Begu of Romania in the opening round of the women's draw with second-seeded American Coco Gauff taking on Australian Ajla Tomljanovic.
Italian Bracciali banned for life, Starace for 10 years
Nagal is coming off a title triumph during the Heilbronn Challenger last week, which happens to be his second Challenger title this season after the Chennai Challenger in February.
World No. 72 Nagal has a tough road ahead as he is placed in the same section of the draw as top seed and World No. 1 Jannik Sinner
Yuki Bhambri and his Dutch partner Robin Hasse went down in straight sets to Ivan Dodig and Austin Krajicek at the Dubai Duty Free Tennis Championships.
It was Sumit's second Challenger title of his career
Sumit Nagal, who recently became the first Indian to beat a seeded player in a Grand Slam tournament, will spearhead the Indian challenge in the men's singles competition of the Chennai Open ATP Challenger 100 tournament beginning on Sunday.
Muguruza wins all-Spanish clash with Badosa at WTA Finals
French Open and Wimbledon champion Alcaraz, who won both of his previous meetings with Sinner this year, recovered from a slow start to wrap up victory in three hours, 21 minutes and improve his head-to-head record with the Italian to 6-4.
Daniil Medvedev fired Russia into the final of the ATP Cup on Saturday with a tense 3-6, 6-3, 7-5 win over an injury-hampered Alexander Zverev after the German destroyed a racket in frustration over a lost service break.
American great Billie Jean King had called for a unified governing body for men and women years ago but the 29-year-old Johanna Konta feels Federer's comments have brought attention back to the topic.
Novak Djokovic ruthlessly took Matteo Berrettini apart at the ATP Finals on Sunday as he began his quest to reclaim the number one ranking by winning his opening group match 6-2, 6-1.
India's non-playing Davis Cup captain Rohit Rajpal on Saturday clarified that his "shut-up" remark was meant for a few "agenda-driven" people consistently targeting him and was not directed at the country's tennis community as has been projected.
Roger Federer's proposal to merge the tours gets thumbs up from top players.
World number one Novak Djokovic began his quest for a sixth title at the season-ending ATP Finals with a 7-6(4), 6-2 victory over Norway's Casper Ruud in their round robin encounter in Turin on Monday.
Jannik Sinner is primed for a Wimbledon title tilt after picking up his first grasscourt trophy at Halle
