The Aussie talent was up two sets to one before heckling from a section of the crowd inside the Queensland Tennis Centre triggered a dramatic, angry fightback from the World No. 5.

The match headed into the fifth set before De Minaur scored an early break to lead 3-0.

Zverev rallied again to level the match at 3-3 in the fifth set.

The decisive fifth set took yet another dramatic turn when De Minaur rallied to take a 5-4 lead which forced Zverev to serve to stay in the contest.

Serving at 5-5, De Minaur had to defend a break point which would have given Zverev a shot at serving the match out.

The 18-year-old came up big with a cranked forehand down the line before going on to lead 6-5.

De Minaur might have been able to close it out in the fourth set, before Zverev found another gear after being heckled by the local crowd.

Zverev was on the verge of losing his cool when he stormed to the chair umpire demanding action against a noisy section of fans inside the Queensland Tennis Centre.

Serving at 3-3 in the fourth set, Zverev reacted angrily when fans yelled out when he was in the act of serving.

The fans were identified by Channel 7’s Todd Woodbridge as belonging to the “We The People” cheer squad.

“That is just disrespectful on another level,” Zverev complained to the umpire.

“That’s impossible. I understand they’re cheering. That’s fine. They can be as loud as they want, but they can’t do that.”

Woodbridge said the fans’ actions crossed the line.

“Sascha’s right, it’s one thing to be vocal and supportive. Another thing to be deliberately trying and put the opponent and travelling team off,” Woodbridge said.

“The other thing is you don’t want to wake a sleeping giant.”

That’s exactly what happened.

Zverev pulled off seven points straight to break De Minaur’s next service game to love.

The German had to defend two break points in his next service game, but eventually served out the fourth set 6-3.

Roger Rasheed described the fans’ interference as the trigger that got Zverev back into the tie.

“There was probably what I would call an angry moment from Alexander Zverev,” he said.

“From then on he actually started talking to himself. Getting himself in a really good, energetic frame of mind. He got the job done. And taken it into a fifth set.”

Earlier, De Minaur seized his moment at 2-2 in the second set to break Zverev’s serve before going on to serve out the second set 6-4 in 45 minutes without having to defend a break point.

De Minaur appeared to be in trouble at the start of the third set, where he had to negotiate two break points on his serve down 1-2.

But he held his nerve and then turned the tables on Zverev by breaking at 3-3.

He went on to serve out the set 6-4 in 40 minutes.

The day started on a prickly note when Zverev sensationally had a late crack at troubled Aussie Bernard Tomic.

Zverev questioned Tomic’s commitment before laughing off the former world No. 17’s claim he could return to the sport’s elite this year after an ill-fated reality TV stint.

Team captain Lleyton Hewitt earlier this week said he doubted whether Tomic would play Davis Cup again after the tennis bad boy claimed Australia could not win without him on Network Ten.

Hewitt, though, would not bite when Tomic’s controversial yet short-lived stay on Network Ten’s I’m A Celebrity ... Get Me Out of Here inevitably came up at the Cup tie draw on Thursday.

“We are not going to get into that,” Hewitt said.

Zverev had no problem giving his opinion, initially poking fun at the short duration of Tomic’s stay in the South African jungle for the TV show. Tomic lasted three nights before citing depression and becoming the first person to quit the show.

“He was there for what? Six hours? Something like that,” Zverev laughed.

“It was great fun for the viewers for the one day that it lasted.”

The German No. 1 also doubted whether Tomic — now ranked No.168 — could hit the pointy end of the rankings this year after the TV show disruption.

“Didn’t he say he wanted to be top five by the end of the year, something like that, when he left the jungle camp or whatever you call it?” Zverev said.

“Good luck to him, that’s all I can say.

“But hopefully he can get back to playing tennis and at a good level again.

“Because he has the talent, we all know that, he has shown that on multiple occasions.

“He has to figure out what he wants to do first.”

— with AAP