WIMBLEDON, London -- Wimbledon is about to undo its top button, throw away its purple-and-green striped tie and reveal its wild side.
Nick Kyrgios, probably the most emotionally volatile man in tennis, is due to have a second-round meeting on Friday with Dustin Brown, whose own coaching consultant describes his tennis as "organised chaos".
The All England Club has never known a match between two such unpredictable characters, and it's hard to imagine how many tweeners, trick-shots and emotional outbursts it will produce.
It's the so-called bad boy of the game versus 'Dreddy Tennis', and Kyrgios has been predicting "a circus".
One certainty is that the meeting between the Australian No.15 seed and the German-Jamaican, a wild card by entry and inclination, will bring a new audience to the sport. If ever there was an occasion to engage the millennials, then this is surely it.
"This one match could change the image of Wimbledon for some. It's going to be insanely exciting, it's going to be fun," Brown's coaching consultant, Australian Craig O'Shannessy, told ESPN.
"People will be going out of their way to watch this match. Globally, the excitement levels are so high. It's not just about the ball and the court -- there are personalities involved. This match is a real gem. It could end up being the gem of the tournament."
O'Shannessy added: "We know how Novak Djokovic plays and what he does, and we're all impressed with him. But matches like these showcase the excitement and flair in tennis. Both [players] will be feeding off the electricity in the crowd."
This match just happens to bring together two men who have defeated Rafael Nadal at Wimbledon. Kyrgios did so in 2014 and Brown last summer, but they have so much more going for them than past glories against the Majorcan, even if he is a former champion on these lawns.
The prospect of these two characters colliding is fascinating. On one side of the net there is Kyrgios, still only 21 years old and already the owner of a list of run-ins with tennis officialdom longer than most players manage in an entire career.
The latest of those altercations came in his opening-round match against Radek Stepanek of the Czech Republic when he was warned for swearing, a reprimand he called "rubbish".
On the other side, there will be a serve-and-volleying rastafarian who has dreadlocks half the length of his body, as well as a tongue piercing and a tattoo of his father over his rib cage.
Then consider Brown's back story, how for years he travelled from tournament to tournament in a Volkswagen camper-van.
Kyrgios and Brown are friends. In fact, they're so close that Brown has apparently allowed the Australian to touch his dreadlocks. There have also been times when Kyrgios has sat in front of his computer watching and re-watching one of Brown's trick-shots.
"This one match could change the image of Wimbledon for some. It's going to be insanely exciting, fun." Craig O'Shannessy
"Dustin's tennis is awesome. I'm a massive fan of his tennis," Kyrgios said. "He can pull out shots from anywhere."
This will be their first match. And the warmth of their relationship will count for nothing, with Brown looking for ways to disturb Kyrgios' equilibrium, possibly tipping him over the edge.
"Dustin is going to try to get Nick to hit the self-destruct button," said O'Shannessy, who works alongside Brown's regular coach Scott Wittenberg,
"He'll have a plan for which things are going to upset Nick, mentally and emotionally, and which will take the edge away from Nick's A-game.
"If Dustin plays an awesome match of tennis, it's going to be easier to get Nick to self-destruct."
While Kyrgios is partial to a through-the-legs tweener -- he hit one of those against Nadal, and another against Stepanek -- the most unpredictable of the two will be Brown.
"Dustin's game is organised chaos but sometimes he can venture too far towards the dark side," O'Shannessy said.
"By the dark side I mean the secondary tactics such as hitting drop-shot returns. Some of those shots, they defy the laws of physics.
"Serve-and-volleying as much as Dustin does is also unusual. Hitting a second serve as a first serve is very unusual. Hitting a flat winner at more than 100mph, when you're standing six feet behind the baseline, that's unusual, too.
"Some of Dustin's tennis is a reminder to the rest of us that there are elements in his game that we should still be embracing. It's about doing anything you can to make your opponent uncomfortable.
"When Dustin's on, and there's electricity around the court, and he's able to enforce his will, there are few people who can stop him. You know that this is going to be fantastic. From a fan's perspective, we all hope that it goes to five sets and the guys leave everything on the court."
There might just be some unorthodox racket swings when these two play. Perhaps a few mood swings, too.