Watch Ons Jabeur's backstage Roland Garros hijinks with Novak Djokovic and Aryna Sabalenka

She's the Minister of Happiness for fans around the world ... and her fellow players.

While Novak Djokovic and Aryna Sabalenka clinched berths in the quarterfinals of Roland Garros on Monday in contrasting fashions, they both had one thing in common: They were both targets of Ons Jabeur's backstage hijinks behind the scenes in the player area.

As Sabalenka grooved her way down the stairs of Court Philippe-Chatrier's player tunnel after beating American Emma Navarro in two straight-forward sets in Monday's second match on the court's order of play, to the tune of the Bee Gees' famous hit, "Stayin' Alive," she was surprised by a very special partner for her latest Roland Garros dance break.

"Come into the camera, so everyone understands," Sabalenka could be heard telling her "bestie" as they locked eyes, and broke into a duet.

Later, the three-time Grand Slam finalist also had a surprise-and-delight planned for Djokovic, who was playing third up on the court, prior to the start of his third-round match against Francisco Cerundolo.

As the pair exchanged a high-five and a hug, Jabeur could be heard dubbing Roland Garros' ironman, whose third-round affair against Lorenzo Musetti had finished past 3 a.m. just 37 hours earlier, "the minister of playing late."

The quip earned a hearty laugh from Djokovic, though the tournament's match scheduling continued to be a serious topic of conversation for the second day in a row when Alexander Zverev and Holger Rune's fourth-round match finished just short of 2 a.m.

After Djokovic won a second straight five-setter, this time against Francisco Cerundolo in four hours and 39 minutes, Jabeur quickly logged on to social media to keep their good vibes going.

"Never underestimate the heart of a champion," she wrote in praising the world No. 1.

Jabeur will step out from backstage and into the spotlight in the first match on Chatrier on Tuesday as she faces Coco Gauff for a spot in the semifinals.