'Is that a 24-pack': Tennis fans go wild over Rafa Nadal's Aussie selfies

Rafael Nadal has delighted his social media followers with some iconic Aussie snaps at Rottnest Island.

Nadal followed in the footsteps of Roger Federer on Wednesday by taking a selfie with a quokka during a government-sponsored trip ahead of the ATP Cup.

"They are super friendly, not too scared to be close to people," he told reporters.

"We had some fun with them."

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He also took a dip in the water and posed for some shirtless photos with Team Spian teammates Roberto Bautista Agut, Feliciano Lopez and Pablo Carreño Busta.

“Perfect way to start 2020 with good friends,” Nadal wrote on Instagram.

“Beautiful bathing suit Rafa. You need to share your fashion sense with your team mates haha. Whether you’re on the court or on the beach you always dress with class!!!!” one follower commented on the pics.

“Is that a 24-pack?” another asked.

ATP Cup to kick-start summer of tennis

The big four may have been reduced to the terrific two but there's still enough star power for the inaugural ATP Cup to make a fresh mark in Australia's summer of tennis.

Starting on Friday and played across Sydney, Brisbane and Perth before the finals in the Harbour City, the men's teams event has a couple of big things going for it in world No.1 and No.2 Nadal and Novak Djokovic.

The pair won't be joined by 20-time grand slam winner Federer (withdrew citing family reasons) and the other member of the once-fabled quartet, Andy Murray (injured).

But with young guns like Daniil Medvedev, Stefanos Tsitsipas and Alexander Zverev on show the line up remains impressive for the Australian Open tune-up.

Effectively replacing three decades of the Hopman Cup mixed teams event, Brisbane International men's event and the Sydney International in the January calendar - that latter of which struggled to attract a strong men's field - the ATP Cup may take some bedding in.

Coming just six weeks after the revamped Davis Cup teams event, which featured 18 teams contesting a finals tournament in Spain, all it could be seen as overkill.

Canadian up and comer Denis Shapovalov thought as much, suggesting the two events should merge in future.

"I think the timing is interesting. I think it is a little bit strange to have it at a similar time as Davis Cup," he said on Wednesday.

"It is a weird feeling playing a world championships then coming into another event that is pretty much the same thing."

Djokovic already raised concerns about the two teams events co-existing but the likes of German world No.7 Zverev said he was a big fan of the new competition.

Sydney short on star power?

Defending Australian Open champion Djokovic will be based in Brisbane with his fellow Serbs for the round-robin phase alongside seven other teams, including Australia, who are headed up by Alex de Minaur and Nick Kyrgios.

With Nadal in Perth with David Cup champions Spain alongside the likes of Medvedev's Russia, it leaves Sydney short on talent until the knockout phases when the NSW capital hosts the last eight teams.

While teams can nominally get by with two players for the matches which include two singles clashes and a doubles fixture each, they can call on up to three more participants.

That opens the door on some key players sitting out ties or individual rubbers, the counterpoint being they'd still be available for later fixtures if their team was still involved.

Some new technology will be used at the event, including an artificial intelligence system that players and coaches can use for analysis. Video reviews include six dedicated cameras for detecting foot-faults and team zones will replace the player chairs near the umpire, allowing on-court coaching.

The winner will be decided on January 12 in the final at Sydney Olympic Park Tennis Centre.

with AAP