Carlos Alcaraz said on Tuesday he has pulled out of the Davis Cup Finals in Bologna due to a swollen hamstring.
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.
Jannik Sinner said he had to prioritise preparations for his Australian Open title defence.
Roger Federer's decision to withdraw means Switzerland can no longer take part in the nation-based event on January 3-12
Djokovic helped Serbia to a 3-0 victory over Japan in their Group A opener on Wednesday at La Caja Magica where a revamped Davis Cup climax is being contested by 18 nations over seven days.
Organisers played a wrong national anthem for Moldova ahead of their tie against Belgium in Sydney. Denis Shapovalov won the battle of the next generation against Greek Stefanos Tsitsipas to help Canada to an emphatic 3-0 victory in the inaugural ATP Cup men's team event in Brisbane on Friday.
Novak Djokovic has pulled out of the Serbia team for the ATP Cup in Sydney, event organisers said on Wednesday, raising further doubts over whether the world number one will defend his Australian Open title next month.
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.
Former world number one Andy Murray is in line to play Grigor Dimitrov in the opening round of the inaugural ATP Cup, with Bulgaria qualifying among the final six teams in the nation-based tournament.
Russian Daniil Medvedev's 2022 season opened with a stunning defeat at the hands of Frenchman Ugo Humbert after a three-hour dogfight in a steamy Ken Rosewall Arena at the ATP Cup on Sunday.
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.
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.
Muhammad Shoaib overcame immense challenges to win an ITF Futures title in Islamabad, ending Pakistan's 20-year wait for a singles title in international tennis.
Defending champions Italy moved into the Davis Cup final after a 2-0 win over Australia on Saturday as Jannik Sinner defeated Alex de Minaur in straight sets to follow up Matteo Berrettini's victory over Thanasi Kokkinakis.
Jannik Sinner has decided not to take part in this year's Davis Cup Finals with reigning champions Italy confirming his absence in Monday's team announcement, while world number one Carlos Alcaraz will represent Spain at next month's competition.
Novak Djokovic proved to be a calming influence throughout
Novak Djokovic, who has won a record nine titles at Melbourne Park including the last three, has repeatedly declined to reveal whether he has been vaccinated against COVID-19, with Australian Open organisers Tennis Australia confirming that all players would have to be vaccinated to compete in Melbourne.
Rafael Nadal to play for Spain in new Davis Cup Finals while World No 1 Novak Djokovic and Roger Federer, have already said they would support the ATP Cup -- seen as a rival team event to the Davis Cup -- when it begins in Australia just a few weeks after the ITF's flagship event.
Jannik Sinner and Carlos Alcaraz are among the world's top players calling for the Davis Cup to return to its traditional home-and-away format and be staged over two years, a proposal backed by ATP chairman Andrea Gaudenzi.
The winners of the Serbia-Germany tie will join Spain, Russia and Italy in the semi-finals.
The escalating conflict involving the U.S. and Israel with Iran has led to widespread disruption in the world of sports, with events postponed, travel plans thrown into chaos, and athletes seeking asylum.
Daniil Medvedev fired Russia to victory in the $7.5 million ATP Cup with a dominant performance against Italy in Melbourne on Sunday.
Rafael Nadal overcame a temporary blip on his way to victory at the ATP Cup on Saturday
India takes on the Netherlands in the Davis Cup Qualifier, relying on faster playing conditions and the return of Yuki Bhambri to overcome a depleted Dutch side.
Summary of sports events and persons who made news on Saturday
Carlos Alcaraz says winning all four Grand Slams at 22 has only fuelled his hunger, but the world No. 1 insists he won't chase a calendar Slam, choosing instead to take the majors one at a time.
Alex De Minaur and Nick Kyrgios fell to the ground in relief and celebration after winning the half hour-long extended tiebreak
Italy sealed a place in the semi-finals of the ATP Cup by winning both singles matches against France
Tennis's flagship team events the Davis Cup and Fed Cup Finals have been postponed until 2021 because of the COVID-19 pandemic, the International Tennis Federation (ITF) said on Friday. Professional tennis has been suspended since March and will not return until August.
While off-court battles over pay and governance rumbled on, opportunities were scarce beyond the duopoly at the top of the men's game, leaving Djokovic to provide the year's standout moments for the chasing pack.
Stanislas Wawrinka will hang up his racquet at the end of 2026, the three-times Grand Slam champion announced on Friday, bringing down the curtain on a 24-year professional career that saw him gatecrash tennis's elite during the sport's golden era.
Italy returned to the Davis Cup final after a gap of 25 years as Jannik Sinner beat Novak Djokovic in both singles and doubles to secure a 2-1 victory over Serbia on Saturday that earned the 1976 champions a title clash with Australia.
Just nine days after his loss to Fritz, which snapped his 13-match unbeaten streak, the world number one defeated the American 6-4, 6-4 in straight sets, capping an incredible debut at the ATP 500 event and securing his career-best 67th season win, continuing a dream season.
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.
'I have no idea what's happening right now, I'm not in a dream, it's just crazy. I'm just so happy with my performance these past two weeks.'
A final decision is expected by March based on the hosting and COVID-19 contingency proposals received from bidders.
A sluggish Carlos Alcaraz was beaten 6-7(3), 6-3, 6-4 by Alexander Zverev on the his debut at the ATP Finals on Monday to continue his end-of-year slump with a third straight defeat.
Italian Bracciali banned for life, Starace for 10 years
Australia booked their place in the Davis Cup semi-finals as doubles pair Matthew Ebden and Jordan Thompson clinched the deciding rubber against the United States on Thursday.
Jannik Sinner beat defending champion and Spanish second seed Carlos Alcaraz to win his first Wimbledon title.