Roger Federer turned 40 on Sunday amid uncertainty over whether he will grace the stage of a grand slam again.
Both he and Serena Williams, who reaches the same birthday landmark in September, have kept their future plans under wraps.
However, it would come as no surprise now if one, or both, were to retire by the end of the year.
Injuries are taking their toll, and even the greatest champions cannot go on forever.
Stats Perform looked at both Federer and Williams, considering what they may still want to achieve, and their prospects of attaining those remaining goals.
Federer's final fling?
Ahead of his 30th birthday, Federer was asked what it felt like to hit such a milestone.
"Birthdays happen. They're part of life," Federer said. "I'm happy I'm getting older. I'd rather be 30 than 20, to be honest. To me it's a nice time."
A decade on, Federer has good reason to be satisfied with life as he chalks up another decade. Family life is good, he'll never need to borrow a dollar, and he has advanced from 16 grand slams to 20.
But the knees would sooner be 30 than 40, and Federer, remarkable sportsman though he is, looks to have entered the lap of honour stage of his career – if he can even complete such a lap.
Two knee operations in 2020 were followed by a setback that ruled him out of the Olympics and will also keep him sidelined for the Toronto and Cincinnati tournaments before the US Open.
Will Federer make it to Flushing Meadows, where he won five successive titles at the height of his career? There has to be doubt over that, and should he indeed be an absentee in New York, what is there left to target? The Laver Cup, perhaps, a tournament in which he is financially invested and which is due to be played in Boston in late September.
Would he play on in 2022? Could he tolerate more long road trips without his family, living in a tennis bubble?
Target: Federer has never settled for second best, and it may have dawned on him at Wimbledon that in all probability he no longer can win a grand slam. Losing a 6-0 set to Hubert Hurkacz on the way to a quarter-final exit would have hurt. The hunger does not go away after 20 grand slams, but Federer's battle-weary body is sending him messages. He will want to go out on his own terms, which means getting fully fit.
Prospects: Assuming the knee issue is not a major problem, and more of a niggle, then Federer could still play the US Open, Laver Cup, Indian Wells and Paris Masters this year. If the mind is willing but the body does not comply, however, then it would not be a shock to see him call time before the Australian Open comes around in January.
Serena still one short of Court
From precocious teenager to queen of the tour, Williams' tennis journey has been a 25-year odyssey and there is nobody more driven to succeed than the great American.
It is an intense frustration that she remains rooted on 23 grand slams, one short of Margaret Court's record haul, and the four grand slam final losses she has suffered while on that mark have been cruel blows.
As her 40th birthday approaches on September 26, prospects of matching Court are fading. The leg injury that cruelly forced her out of Wimbledon in the first round was a harrowing turn of events, given she looked primed to be a big title challenger in London.
She is becoming less of a factor when looking at title favourites, but Williams is still capable of beating top players, still a threat wherever she shows up. It comes down to whether the body lets her chase her goals, and whether the pain of so many near-misses in recent years persuades this great champion the exertion is no longer worth prolonging.
Target: The 24th slam has been the must-have for Williams. Tour titles feel like an irrelevance, and Williams has won just one of those since January 2017, her calendar built around peaking for the majors since returning from giving birth to daughter Olympia.
Prospects: Beating Aryna Sabalenka and Simona Halep at the Australian Open demonstrated Williams still has the game for the big stage, and a semi-final defeat to Naomi Osaka, to whom she has now lost in three of four encounters, should not particularly detract from that. Wimbledon felt like a golden opportunity, with a host of major rivals absent and others struggling for form. There is no doubt she felt that way. Getting to 24 – and beyond – has shifted from feeling like an inevitability to being an odds-against chance now.
Sinner guides Italy to back-to-back Davis Cup triumphs
Jannik Sinner capped his outstanding year by helping Italy retain the Davis Cup, beating Tallon Griekspoor to ensure Italy downed the Netherlands 2-0 in Sunday's final.
World number one Sinner overcame Griekspoor 7-6 (7-2) 6-2 after Matteo Berrettini had registered a 6-4 6-2 win over Botic van de Zandschulp in the opener.
Sinner saved the only two break points of the first set as Griekspoor put up a fight, but the Italian put on a show in the tie-break to inch ahead.
Griekspoor hit back after giving up an early break in the second set, but Sinner immediately responded with two further breaks, with the Dutchman double-faulting for the first then wildly miscuing with a backhand for the second.
Sinner was untroubled from then on, sealing a triumphant end to a spectacular season.
The Italian has only dropped one set throughout that streak, finishing a year that saw him win the Australian Open, US Open and ATP Finals with a 73-6 singles record.
Data Debrief: Sensational Sinner leads the way
This has been a truly remarkable year for Sinner, who has become the first man in the Open Era to win at least one set in every match throughout a season since Roger Federer in 2005.
His victory ensured Italy became the first team to retain the Davis Cup since the Czech Republic triumphed in 2012 and 2013.
Italy also captured the Billie Jean King Cup earlier this week, and they are just the third nation to claim both trophies in the same season in the last 30 years, after the Czech Republic in 2012 and Russia in 2021.
Jaiswal, Kohli tons put India on the verge of win against Australia
Yashasvi Jaiswal and Virat Kohli bagged magnificent centuries to put India in a commanding position on day three of their first Test match against Australia in Perth.
India declared in a dominant position of 487-6 after Jaiswal (161) built on their 172-0 at stumps on day two and former captain Kohli (100 not out) added quick runs with his first century in 16 months coming up during the final hour.
The tourists then wreaked havoc with the ball in five overs before stumps as captain Jasprit Bumrah dismissed debutant Nathan McSweeney (zero) and Marnus Labuschagne (three) before nightwatchman Cummins (two) fell to Mohammed Siraj with the score at 12, as the hosts trail by 521 runs with seven wickets in hand.
Earlier in the Test, India had scored 150 batting first before bundling out Australia for 104 in the first innings.
Jaiswal resumed his innings at 90 on the third day and brought up his century in the first hour before KL Rahul departed for 77 after an opening-wicket partnership of 201.
The centurion fell as India's third wicket at 313-3 as Australia picked up three wickets in the space of eight runs, but Kohli reached his ton with help from Washington Sundar (29) and Nitish Kumar Reddy (38 not out) as India asserted their dominance.
Sinner and Berrettini send defending champions Italy into Davis Cup final
Jannik Sinner's victory over Alex de Minaur clinched Italy's place in another Davis Cup final, with Matteo Berrettini also victorious as the defending champions beat Australia 2-0.
Italy won the Davis Cup for the first time since 1976 last year, and they will have an opportunity to defend their crown against the Netherlands on Sunday.
Former Wimbledon finalist Berrettini got the ball rolling with an entertaining 6-7 (6-8) 6-3 7-5 victory over Thanasi Kokkinakis, not surrendering a break after losing the opener in a tie-break.
That teed up Sinner to close out Italy's victory, with the world number one overcoming De Minaur 6-3 6-4, the same scoreline he beat the Australian by at the ATP Finals earlier this month.
Speaking after his victory in Malaga, Sinner said: "It means a lot. It was a tough encounter, playing Alex. We know each other quite well now, so I have to be very careful every time.
"It's a very tough challenge for me, so I was looking forward to this one. Obviously, it helped a lot that Matteo won the singles today. He played amazing tennis. It was very high quality.
"Hopefully, this can give us some confidence for [Sunday]. It's going to be a very difficult and tough day for us and also the Netherlands."
Data Debrief: Back-to-back for Italy
Italy's men are looking to follow in the footsteps of their female counterparts, who won the Billie Jean King Cup earlier this week.
They are just the third nation in history to make back-to-back finals at both the Davis Cup and the Federation/Billie Jean King Cup, after the United States (1963-64, 1978-79, 1981-82 and 1990-91) and Australia (1963-64 and 1964-65).
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