Halep beat Jelena Ostapenko 6-2, 6-4 to become the first Romanian No. 1 when the rankings are released Monday.
"It was a tough match, he's one of the best players in the world right now", Kyrgios said of his vanquished opponent, ranked four in the world. The No. 1 seed won the last four games of the first set.
The temperamental world number 19 continued to let the incident bother him and later received a one-point penalty for continuing to complain.
"The feeling is if he really wants to play and wants to work, he is one of the players that have more talent to achieve a lot of things in this sport", said Nadal, who will go immediately on next to the Shanghai Masters.
Kyrgios looks relaxed during his comfortable win over Zverev. When I saw the draw at the beginning of the tournament, I knew that it will be very, very hard to have good chances here.
"I mean, I obviously didn't react professionally. Sorry, Canberra! You know I love you".
In the women's event, France's Caroline Garcia also defeated world no.1 Simona Halep from Romania in straight sets of 6-4, 7-6 (3).
The 16-time men's singles Grand Slam champion had to save two match points in his opening game against Lucas Pouille, but since then was assured in his performances, which included wins over big serving John Isner, Grigor Dimitrov in the semi-finals and Kyrgios in the summit clash. The 22-year-old is on the verge of finishing the season without a title.
He has made no bones about not taking tennis seriously enough, and on Monday said it was down to feeling like he had no real objective in life. Garcia said afterwards, asked what was in her mind when she slumped to her knees.
"It was such an awesome two weeks", Garcia said.
The match came to an end after an hour and 32 minutes of play.
With rain teeming down outside ahead of what turned out to be a cracker, a leak in the Diamond Court stadium roof had threatened to dampen proceedings. But I was lucky the first day saving the two match points.
"It is normal that at some point these kind of players that are playing a lot of matches and a lot of years in a row, at some point they have some problems". That's very hard. Then, of course, he has great hands and a fantastic serve.