NICK Kyrgios' displeasure at being denied a medical time-out on an injury he says could threaten his Australian Open campaign while his opponent was granted time to change clothes has been met with widespread support from fans.

On his way to beating Ryan Harrison of the USA to claim his first title on home soil and fourth of his career, Kyrgios stood aghast after tour supervisor Gerry Armstrong denied him the chance to have a medical time-out for treatment on the left knee which he has had taped for all four matches he played this week.

Rules state players are not granted medical time outs for pre-existing injuries, and this infuriated Kyrgios and fans alike.

"How is that a rule? That rule should be changed … it's getting worse,'' Kyrgios told Armstrong.

"What about a medical time-out? This is an injury which could keep me out of the Australian Open. Imagine how I feel.''

After the first set, Kyrgios debated with chair umpire Fergus Murphy suggesting that Harrison should not have been allowed such a long break to go off court, while he waited in his courtside chair.

Harrison left to change his clothes, Kyrgios was unimpressed.

"I can't take a medical time out for taping but he can have one for getting changed?" he said.

"How long can it possibly take? Eight minutes to get changed? It's interesting, it doesn't make sense."

What I was wondering (on court) was why I couldn't take a medical timeout for the knee taping,'' Kyrgios said.

"I was saying for instance if my knee was to keep me out of the Australian Open _ which, who knows it could? _ why can't I get a medical timeout. It was professional curiosity."