Aryna Sabalenka has claimed her second-straight Brisbane International title, beating Marta Kostyuk 6-4, 6-3 in 1 hour, 17 minutes.

Belarusian Sabalenka locked eyes with the Ukrainian and kissed both biceps after sealing the win.

It was a possible nod to comments made by the Ukranian about how strong Sabalenka was and that she had more higher testosterone levels than other players, quotes Kostyuk said were taken out of context.

Sabalanka said that was not the purpose of the display: "I think because during the game I made a lot of aggressive, heavy winners when I see the speed, so I was just making fun with my team," she said.

But regardless, it was an ice-cold end to a sizzling display from the world number one.

Aryna Sabalenka said Kostyuk's approach to dealing with Belrusian and Russian players did not bother her. (Getty Images: Albert Perez)

She was even in a good enough mood to aim a cheeky dig at her boyfriend Georgios Frangulis in the stands, suggesting that she wanted a proposal.

"I want to say thank you to my boyfriend, hopefully soon I will call you somehow else?" to uproarious laughter on Pat Rafter Arena.

"That just put extra pressure, right?"

Pressure on Frangulis, but by claiming victory in such ruthless fashion, the 27-year-old ensured the pressure was on her rivals if they wanted to be able to stop her from reclaiming the Australian Open crown in Melbourne in the next couple of weeks.

Aryna Sabalenka now has two Brisbane International trophies. (Getty Images: Bradley Kanaris)

In an occasion with as many variables as a match of tennis, it is incredible how often the first game can predict the outcome.

The first handful of points can act as a barometer of what is to come.

Kostyuk attacked all three second serves she saw in the opening game, understanding that attack was the best form of defence.

All three returns went long — barely. A wry look from Kostyuk the only reaction to her errors that drew barely a flicker of disquiet upon her face.

There was little outward display of emotion when the Ukrainian faced the first of three break points in her opening service game, either.

There was, though, when a double fault — her second of the game — handed Sabalenka a fourth break chance, a slap of her leg in admonishment.

Sabalenka, the combative warrior that she is, let out an encouraging yell of her own as if to emphasise her opponent's anguish.