Roger Federer expressed his hopes for former rivals Novak Djokovic, Rafael Nadal and Andy Murray to "keep playing forever", insisting the ATP Tour is "better with them".
Federer called time on his glittering career in 2022, while the other three - who between them formed tennis' 'big four' - appear not to be far away from joining him in retirement.
Nadal, who will miss Wimbledon to focus on his "last Olympics", and Murray are expected to hang up their racquets this year, with the latter revealing in February that he does not "plan on playing much past this summer".
Meanwhile, 24-time major winner Djokovic is also likely be absent from the grass-court major, having undergone knee surgery following his withdrawal from the French Open last week.
Now in their late 30s, all three players are certainly at the twilight of their remarkable careers.
But Federer, who says the quartet all now "get on super well" after years of rivalry, hopes they are not finished just yet.
"I really don't think there are any words of advice that I can give him," he told BBC Sport. "Retirement is so deeply personal. When you take that decision, everybody is in a completely different circumstance.
"We've gone through similar things, but I'm too far away to give advice. If [Andy] called me up, I'd be happy to answer some questions. He's had this massive hip issue and what he is doing is inspirational.
"I hope Andy, like Rafa and Novak, can keep playing forever, like a fan. The tour is better with them. I was watching Roland-Garros last week, and I was like: 'Wow, they're so good - I used to do that too!'
"It's tricky sometimes and there’s definitely moments when you don't like a certain opponent, but then you like him so much. It's important to remember this as a player - it is just tennis and, in the end, we can be normal.
"You see us being super friendly with each other after the rivalry, and we get on super well."
Murray set for back surgery in bid to be fit for Wimbledon swansong
Andy Murray will undergo back surgery in an attempt to be fit for what will be his final appearance at Wimbledon, which begins in nine days.
The two-time competition winner was forced to retire from his second-round match at the Queen's Championships against Jordan Thompson after just five games.
It was later revealed by the 37-year-old that he had been suffering with back pain which eventually spread to his right leg, forcing him to withdraw from the competition.
The two-time Olympic gold medallist is set to call time on his illustrious career later this year, with Wimbledon and the Paris games described as a fitting end to his 20-year spell on the court by Murray.
But the former world number one faces a race against time to fit for Wimbledon, which starts on July 1, where he is also set to feature in the men's doubles with his older brother, Jamie.
“He saw a specialist yesterday evening and he’s basically trying to decide what his next move is," his brother told BBC Two on Friday.
"I don’t think it’s right for me to go into that personally, that’s up to him, but I think he has got a few decisions to make.
"It’s obviously incredibly disappointing for him that this was potentially going to be his last Queen’s, last Wimbledon and Olympics, and there’s a potential that that might not be able to happen.
"I think he’s got to make a few decisions, and see where he goes from there.”
Draper's dream run ended at Queen's by Paul
Jack Draper's dream run at the Queen's Club Championships was halted at the quarter-final stage on Friday as Tommy Paul edged a hard-fought contest in three sets.
Having claimed his maiden ATP Tour title in Stuttgart last week, Draper made it seven straight victories with a huge upset of world number two Carlos Alcaraz on Thursday.
However, he could not extend that winning streak as Paul attacked his serve on every opportunity, hitting several excellent groundstrokes as he took the opener.
Draper hit back in the second set, a long forehand seeing him convert his second set point.
However, the new British number one appeared fatigued in the decider, his exertions against Alcaraz taking a toll as Paul kicked on, breaking to love in the seventh game and seeing out a 6-3 5-7 6-4 victory.
Data Debrief: Draper falls short
Playing in his second Queen's quarter-final, Draper could have become the first home player to reach the last four since Cameron Norrie in 2021.
He was unable to stay the course against a fresher opponent, though, as fifth seed Paul improved to 25-10 for the season, reaching his second tour-level semi-final on grass.
Zverev survives early scare to pass Fils into Halle Open semi-finals
Alexander Zverev battled past Arthur Fils despite losing the first set to book a place in the Halle Open semi-finals.
The German, chasing his first-ever grass-court title, needed two and a half hours to get his 6-7 (5-7) 6-3 6-4 victory.
Neither player managed a break in the opening set, matching each other evenly before Fils finally got the edge in the tie-break to take the lead.
Zverev soon raised his level though, and during a run of eight consecutive points, broke the Frenchman to love at 3-2 on his way to forcing a decider.
Despite another bright start to the set by Fils, he failed to get a single break, with Zverev rallying to set up a meeting with Hubert Hurkacz in the next round.
Data Debrief: Zverev edges ever-closer to grass title
Zverev is 37-10 for the season, and is the first person since Roger Federer (2012-19) to reach back-to-back semi-finals at the Halle Open.
A two-time finalist at the tournament, the German is hoping to add two more wins to his 18-7 record in Germany to finally get his hands on the trophy.
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