MELBOURNE, Australia — Rafael Nadal left the muttering and the preening, the underarm serving and the ‘tweening to his younger, flashier opponent, Nick Kyrgios.

Nadal was content to collect the win in the latest installment of their rivalry.

The No. 1-ranked Nadal kept his thoughts to himself and limited his shot-making to the more traditional variety in an entertaining 6-3, 3-6, 7-6 (6), 7-6 (4) victory over home-crowd favorite Kyrgios on Monday to reach the Australian Open quarterfinals and get closer to a record-tying 20th Grand Slam title.

These guys don’t like each other. But Nadal had nothing but nice things to say after improving his head-to-head record to 5-3 against Kyrgios.

“When he wants to play, when he is focused on what he’s doing, I think he’s a very important player for our sport,” Nadal said, “because he has a big talent and is one of these players that can be very, very interesting for the crowd.”

While Kyrgios was up to some of his usual trick shots and antics, what he never did was waver in his effort, something folks often accuse him of.

“Today,” Nadal said, “I think he played very serious, tried all the time his best.”

It certainly meant a lot to Kyrgios, who said: “I’m shattered to have lost tonight. These are the matches that I want to win the most.”

Here’s how the elevated stakes and tension affected both men: At 5-5 in the pivotal third-set tiebreaker, Kyrgios double-faulted. That offered up a gift-wrapped set point. But Nadal failed to take advantage because he double-faulted right back.

Still, two points later, the 23rd-seeded Kyrgios put a forehand into the net, and the set was Nadal’s. Not long after, Kyrgios double-faulted again to get broken at love.

That put Nadal ahead 2-1 in the fourth, seemingly in charge.

“Against Nick,” Nadal would say afterward, “you are never (in) control.”

Sure enough, Nadal faltered while serving for the win at 5-4, double-faulting to create a pair of break points, the second of which Kyrgios converted with a jumping forehand and celebrated by throwing his head back and screaming. Spectators rose and roared and waved their Australian flags in support of the 24-year-old from Canberra.

But Nadal regrouped and pulled the win out in the closing tiebreaker, which ended with Kyrgios putting a forehand into the net.

Nadal finished with more than twice as many winners as unforced errors, 64-27.

“I’d have to win a point three times to win a point,” Kyrgios said.

Kyrgios delivered 25 aces and some memorable moments — including walking out on court and warming up for the match in a No. 8 Los Angeles Lakers jersey to honor Kobe Bryant.

Kyrgios switched to a No. 24 Bryant shirt for his post-match news conference and described himself as emotional at the news.

A video tribute to Bryant was played on the Rod Laver Arena scoreboards before Monday’s match.

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