The three stars have won every Grand Slam title since the start of 2017 between them, with their total major tally now a staggering 56 following Djokovic's triumph at the Australian Open last month.
Off the court, the three have a healthy mutual respect for one another and Djokovic has confirmed that the three get along well privately.

Djokovic targeting Federer's Grand Slam record

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"A WhatsApp group? Yeah we do [have one]," he told Dubai Eye.
When pressed on who was the most active participant in the group, he said: "We are all active, and we're all not active. When we are active, everybody responds.
"We get along very well, I think, there's a tremendous respect for each other privately and also professionally. As long as that is the case, everyone benefits from that, also the sport."

Highlights: Djokovic cruises past subdued Federer

Djokovic is the top seed at the Dubai Duty Free Tennis Championships and is due to face Philipp Kohlschreiber in his opening match on Wednesday.
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