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They are in their fifties now, but John McEnroe and Ivan Lendl could meet in the Wimbledon final on Sunday.
Well, by proxy anyway, as long as McEnroe's player, Milos Raonic, beats Roger Federer, and Lendl's employer, Andy Murray, then negotiates his way past Tomas Berdych. McEnroe is new to Raonic's team after joining as a grass court consultant this summer while Lendl and Murray, who worked together from 2012-14, resumed their partnership last month. Their charges have already met once during this grass court season, with the Briton victorious in the Queen's Club final. Will McEnroe and Lendl, who had such a fractious rivalry in the 1980s, have another coaching confrontation, and this time on the biggest stage of all?
Wimbledon.com takes a look at McEnroe and Lendl's contribution as coaches so far.
Coaching style
McEnroe: The New Yorker's television commitments during The Championships - he is working for both the BBC and ESPN - meant that he didn't see Raonic's quarter-final against America's Sam Querrey. But that could work in Raonic's favour. McEnroe was on Centre Court for Federer's instant classic against Croatia's Marin Cilic and so will have a good understanding of how the Swiss has been playing. "John called the entire Federer match," said Raonic, "so I'm sure he's going to have plenty of things to say." That wasn't the first time that McEnroe wasn't able to watch all, or even any, of Raonic's match, but the player doesn't seem to be fussed. He's just happy to have McEnroe around. McEnroe's arrival means there are now three coaches in Raonic's team - he joins former Roland Garros champion Carlos Moya and Riccardo Piatti. When he has the time to sit with Raonic's other coaches, McEnroe is an excitable presence.
Lendl: He has been courtside for every ball of Murray's matches. And whether Murray has been in command, as he was for most of his first four rounds, or embroiled in a five-setter, as was the case in his quarter-final against France's Jo-Wilfried Tsonga, Lendl's expression hasn't changed. All fortnight he has been projecting a blankness, a kind of emotional void (though you know that, behind that visage, there's plenty going on). Lendl isn't the only voice in Murray's ear - he has been working alongside the Briton's full-time coach, Jamie Delgado.
Mental and psychological
McEnroe: The most combative player in the sport's history was never going to ask Raonic to keep a stiff upper lip on court. McEnroe would like Raonic to have more presence on the grass. While Raonic hasn't been raging at the officials, McEnroe style, it's possible to detect a slight change in attitude and approach and that has brought him to a second Wimbledon semi-final.
Lendl: Just having Lendl around gives Murray a little more emotional stability. With Lendl back on the scene, Murray hasn't been grumbling at his guests' box, as he has in the past with other coaches. If Murray is shouting anything in his entourage's direction, it's positive. The other night in his match against Tsonga, he looked over at his team and called out: "There's no way I'm losing this match." While McEnroe has suggested that Murray reforming his partnership with Lendl is akin to going out with an ex-wife or ex-girlfriend again, it's far from stale between Murray and Lendl. You sense that Murray still feels the need to impress.
Bonding with their players
McEnroe: A shared love of modern art.
Lendl: Both Lendl and Murray are dog owners. There's also been plenty of off-court laughter. "Ivan's a great guy and he's always joking. His jokes are anything, really - it's tough to describe them as they're a little random," Delgado has said.
Grass court credentials
McEnroe: Three Wimbledon singles titles.
Lendl: Two appearances in Wimbledon finals - he lost them both.
Strategy
McEnroe: It's McEnroe's view that Raonic should be coming forward more often. And Raonic has been following those instructions. So far, he has served and volleyed 26 per cent of the time, and that strategy has been very successful: he has won 74 per cent of those points. McEnroe's only previous coaching job was with Boris Becker and that didn't work out: "Boris didn't listen to a single word I said." Raonic, though, seems to be hanging on every word that comes out of McEnroe's mouth (and there have been plenty). "McEnroe's message is about me taking time away from the other guy, making the guy feel uncomfortable and playing on my own terms," Raonic has said. "And that means dictating and being aggressive."
Lendl: The first time they worked together, Lendl told Murray to play his shots as it's always preferable to "go down swinging" rather than having "your a** against the back fence". "When I started working with Ivan the first time around, I definitely tried to play more aggressively, whether that meant hitting the ball harder or standing inside the baseline," Murray wrote in his BBC column on Thursday, adding that his attacking approach "didn't stop" when Lendl left the tour in the spring of 2014. On his return, Lendl has been reinforcing that message.
What they have been saying
McEnroe: "It would be nice to make a difference."
Lendl: Not much.
