Andy Murray, Novak Djokovic and Stan Wawrinka, despite having cut their 2017 seasons short after Wimbledon, all managed to get out and hit some tennis balls on Tuesday.

Wawrinka, who underwent knee surgery, got in some backhand target practice.

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He later joked with Darren Cahill that he may be ready to claim his No. 7 spot for the ATP Finals next week in London.

Then there was Murray. In his first appearance since becoming a father of two, the Scot added some local flair to his kit during his charity exhibition against Roger Federer in Glasgow.

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The match also featured "Kilterer," but that is another story.

But the most fun of all was had by Djokovic, who fired serves at The Late Late Show host James Corden.

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If Federer's resurgence after his six months off last year is any indicator of what the future holds for these guys, the 2018 season is going to be explosive.