A besieged Nick Kyrgios has received empathetic support from Australian Davis Cup teammates but even his doubles partner is cautioning the hot-head to “keep it within the boundaries”.

Kyrgios is still awaiting his fate after confessing to spitting towards a “disrespectful” spectator during his drama-charged five-set first-round Wimbledon victory over British qualifier Paul Jubb on Tuesday.

The 27-year-old is certain to cop a sizeable fine, with London’s tabloids savaging Kyrgios as “petulance personified” and for behaving like a “cretin” and “a flagrant, unpleasant narcissist” with an “extreme persecution complex”.

Watch the latest sport on Channel 7 or stream for free on 7plus >>

Thanasi Kokkinakis, who teamed with Kyrgios for Australian Open doubles glory in January and is again partnering his great mate at Wimbledon, said he didn’t see the most-talked-about incident of the first week at the All England Club.

But he shook his head wryly when told, and said: “Obviously you don’t want to be spitting too much unless you know you have a bit of phlegm you have to get out.

“Obviously, you want to be respectable and that, but I didn’t actually see what went on and what he said to the crowd.

“I know when he plays there is always some sort of drama. That’s not too much news to me. As long as he obviously keeps it within reason.”

When pressed on if he ever wished Kyrgios would calm down a little on court, Kokkinakis said: “Man, he’s his own person. He can do what he wants.

“I don’t know really what you want me to say here. Everyone knows how Nick is. He’s a competitive player.

“Some things happen on court a lot of people don’t mean, but sometimes it comes out. I think it just shows he cares and wants to win.

“Obviously you want to be respectable and keep it within the boundaries.”

Lifelong friend and practice partner Jordan Thompson said he knew where Kyrgios was coming from when tennis’s most polarising personality claimed he’d been verbally taunted throughout his Wimbledon opener on outside court 3.

Thompson said he’d been abused to such an extent during a US Open clash with American Jack Sock in 2017 that he felt compelled to confront the heckler mid-match.

“Two drunk guys were trying to get into me and I’d just had enough – I had a few words with them,” Thompson said.

“I wouldn’t say I was the toughest bloke but I just walked over there and said, “What are you guys trying to do, you just trying to provoke me? This is tennis’.

“I might have told ’em that they think they’re tough because they’re sitting behind a railing but I’m the one with the racquet in my hand! That probably wasn’t smart on my behalf but eventually security booted them.”

Thompson, though, said as frustrated as he can get on court some times, he’d never blamed anyone for losing his cool.

“It’s always on me. Nick deals with pressure in different ways to what I do and everyone else,” he said.

“Sometimes you just need a little bit of an out to just release some pressure off himself – whether that be a referee or someone giving him stick in the crowd.

“Yeah, it could go different ways. It could go well or it could go pear-shaped if he gets it out of his system and lets himself release a bit of anger.”

Kyrgios returns to the court on Thursday to play Serbian Filip Krajinovic for a place in the third round.