Nick Kyrgios has called for patience and hopes he’s cut some slack on his seemingly inevitable rise to tennis superstardom.

Kyrgios admits the big four of men’s tennis remain at another level after his straight-sets Australian Open quarter-final loss to Andy Murray.

But the 19-year-old is confident he can bridge the gap and hopes critics heed Murray’s advice to lay off Australia’s great new hope and allow Kyrgios to develop and mature in his own time and way.

“I’m still growing into my body,” Kyrgios said.

“I’ve still got a little bit of time. Obviously after (this loss), I need to get back to work.”

Despite lighting up Melbourne Park with his electrifying run to the last eight and becoming the first teenager to reach two grand slam quarter-finals since the great Roger Federer in 2001, Kyrgios has also copped flak for his brash on-court demeanour.

Murray says the Canberra prodigy needs to be afforded time to mature and develop and “is going to make some mistakes”.

“He’s young and growing up in the spotlight isn’t easy. He’s doing a great job,” Murray said.

While he savoured his latest grand slam as a teenager, Kyrgios admitted it had been stressful dealing with the pressures and expectations and, taking a deep breath and a pause, opted not to buy in to the debate when asked if criticism about his conduct had been unfair.

“Just listen to Andy, I guess. He’s pretty successful,” Kyrgios said.

Australian tennis legend John Newcombe said the manner in which Kyrgios had emulated his run to last year’s Wimbledon quarter-finals had been “nothing short of magnificent”.

“There’s a couple of little things he’s got to tighten up on – breaking the racquets and a couple of other things,” he said.

“(But) the exuberance, the natural vitality out there, the fans are loving it and it’s a great thing for tennis.

“It’s a learning experience for him and it seems to be that he learns from those experiences.

“He’s got a very mature head on his shoulders. He understands where’s he’s at, where he’s going and (he has) a great self belief, which he has out on court.”

Kyrgios’s ranking will rise to No.35 in the world on Monday and, with few points to defend, will continue to climb.

But he battled a back injury all Australian summer and said returning to full fitness was his immediate priority.

“(I’ll go) back home and obviously get the back right,” he said.

“Obviously rehab it until it’s not giving me strife anymore. I’m scheduled in Marseille, Dubai, and then we’ll see after that.”

Turning 20 in April, the young gun said improving his physicality was the key to seriously challenging the likes of Novak Djokovic, Rafael Nadal, Federer and Murray at the slams.

“Murray, it’s incredible how many balls he gets back into play,” Kyrgios said.

“There were points I’d be winning five times over, he’d be making me play an extra ball.

“Those guys are unbelievable athletes. They’re another level. I think that’s what stands out most.”