Zverev revealed the Laver Cup group chat’s most active member. (AP)

Apparently, Laver Cup’s Team Europe got along so well during the inaugural event, they’ve kept up a group chat several months later.

Alexander Zverev revealed the Laver Cup teammates still chat on WhatsApp, the popular messaging app. The group includes Zvererv, Marin Cilic, Dominic Thiem, Tomas Berdych, Rafael Nadal and Roger Federer.

Zverev also revealed the group chat’s most active member. While Nadal, he says, is more likely to reply to messages rather than initiate them, Federer is the chief instigator.

“Roger is the funniest among everyone, he likes to send jokes and funny videos. You wouldn't believe at it if you don't know Roger," the German said.

Federer’s also known to be fond of emojis, as demonstrated by his magnanimous support of his Swiss compatriots during the Winter Olympics.

At 36 years old, he may be one the elder statesmen of the tour, but embracing digital media is one of the many ways Federer keeps himself young.