Ivan Lendl is back in Andy Murray's corner and telling jokes all day, with some of them a little risque.
It is back to the old routine for the pair after they reformed a partnership that proved so productive from 2012-14 when the Briton won the Olympic, US Open and Wimbledon titles. This time, though, Jamie Delgado is with them in a new-look trio.
Behind the game faces that the public sees when Murray is on court -- Lendl has so far been living up his nickname of Old Stoneface, and Delgado hasn't smiled much either during matches -- they have been having fun.
It's early days (Lendl only rejoined the team last week during the Queen's Club tournament) but inside the camp it has so far been about evolution, not revolution.
Murray's practice routines have been tweaked here and there since Lendl arrived they but have remained essentially the same from when it was just Delgado, Murray's full-time coach, on the scene.
As had been the case before Lendl's arrival, such as when guiding Murray to the French Open final, Delgado has continued to identify the times when the player needs to be pushed and when he needs to ease off.
The more obvious changes have come in planning practice and discussing strategy. "Before a match, first Ivan and I will talk to Andy," Delgado told ESPN. "Then Andy will have his say as he's played these players before.
"Andy knows from his own experiences, and from his victories and his defeats, what works and what doesn't work so well.
"We're there to give our ideas. Or just enforce what he's saying. We definitely have our ideas and messages about how we want him to play that particular match."
The conversations before training are similarly collaborative. "Ivan and I have a chat before practice about what we think Andy should be working on. We talk about match-ups and the different guys he's playing, and certain patterns he's going to have to use in the match, and certain patterns he's going to have to practice.
"Ivan and I are on the same wavelength over what Andy needs to improve and what he needs to work on. We agree on how his practices are set out. This week, with the lead-up to Wimbledon, we've got a plan of what's happening each day. We've agreed on all those things so it's been pretty easy, really."
The chemistry between the three men is going to be crucial and the mood in these early days has been good, light. "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 said.
"When you see pictures of myself and Ivan together watching a match, we both look serious because we're engrossed in what's happening on the court and we're living every point. But when Ivan's off the court, it's jokes all round."
Delgado, who became Murray's assistant coach after this year's Australian Open, during the Amelie Mauresmo regime, was keen to take on the senior job alone after the split with the Frenchwoman, and said so publicly.
He was made aware that Lendl's return was a possibility, however, and took the appointment philosophically: "Ultimately, we all want the best for Andy so if Ivan helps, that's a great thing."
Murray has made it clear that he wants Lendl and Delgado to work closely and see "eye to eye", and Delgado, who had only met the Czech-born American once before they started working together, said they are already in tune.
Fortunately for Murray and Delgado, collaborating with another coach -- and a coach who spends more time around the Scot -- isn't a new experience for Lendl.
There was a similar set-up in the Murray camp during the first Lendl era when the former Wimbledon finalist was the senior coach and Dani Vallverdu was the junior figure, or assistant coach.
Immediately after appointing him for a second time, Murray spoke of Lendl being "a leader and strong voice" but also a team player, with that analysis based on how he had behaved towards Vallverdu.
There was great trust and respect between Lendl and Vallverdu, and it sounds as though Lendl and Delgado are developing a similarly strong relationship.
As a winner of eight Grand Slam titles, and a former world No.1, Lendl could have been dismissive towards Vallverdu, whose ranking peaked at 727. He wasn't, and appreciated Vallverdu's insights into Murray. Lendl is already listening to the views of Delgado, who never quite managed to break into the top 100.
"I only caught up with Ivan properly on Tuesday morning last week, as he had just flown in to London the night before," said Delgado. "He's come in at an important time, with Wimbledon about to start. But, in a way, I think that's a good thing. You're straight into the mix.
"There are lots of positives about Ivan coming in, and one of them has been seeing how he goes about things, and I think it's a great learning experience for me as a coach.
"A lot of the things we've been doing with Andy for the last few months are similar to what we're doing now that Ivan's here. So in a way that's a nice confirmation that we were doing the right things."
Can Lendl and Delgado help Murray to win this year's Wimbledon, with what would be a laughter-filled fortnight?
"It's funny, I can't remember where I was when I watched the 2013 final, though I know that I wasn't at Wimbledon that day," said Delgado.
"Andy's playing well enough this year, with the form he picked up on the clay, with the number of matches he played, and the confidence he built up. The last two or three months have given him a lot of confidence. Hopefully, he can have one of those great moments again at Wimbledon."