Iga Świątek has ended her journey to the women's world number one tennis ranking in fitting fashion.

Świątek continued her searing start to 2022, beating Naomi Osaka 6-4, 6-0 to win the women's title at the Miami Open and extend her winning streak to 17 matches.

Świątek, who will replace the now-retired Ash Barty at number one in the women's rankings officially when the points are updated Monday, also completed the so-called Sunshine Double — winning both Indian Wells and Miami.

She's the fourth woman to do so, joining Victoria Azarenka (2016), Kim Clijsters (2005) and Steffi Graf (1994 and 1996).

"This tournament has so much energy," Świątek said.

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Świątek's homeland is Poland, which has seen more than 2 million people enter from war-torn Ukraine in recent weeks. Świątek took a moment during her trophy ceremony to acknowledge that those refugees are on her mind.

Świątek broke Osaka for a 3-2 lead in the first set, hanging on from there to win a 52-minute slugfest that saw the opening game — on Osaka's serve — feature seven deuces and go for 10 minutes.

The second set was a completely different story. Break, hold, break, hold, break, hold and that was that, as Świątek finished off her ninth consecutive straight-sets victory.

It was her third title of 2022 and her sixth consecutive win in a final, a streak that started at the delayed French Open in 2020.

Świątek, who never faced a single break point, earned $US1,231,245 ($1.64 million) for the win. Osaka earned $US646,110 ($862,595) for making the final.

Osaka came into the tournament ranked number 77 in the world, though certainly didn't play like there are 76 better women out there on tour right now — beating seeded players in Angelique Kerber, Danielle Collins and Belinda Bencic on her way to the final.

Osaka was as high as number 13 earlier this year, but saw her ranking take a huge hit when she was knocked out early from the Australian Open, and will likely rise to number 36 when the numbers are officially updated on Monday.

Miami was her first final since winning the 2021 Australian Open.

"It makes me feel so good, makes so many feel so good, to see you happy on the court again," tournament director James Blake told Osaka during the trophy ceremony.

As the cheers from fans got louder, Osaka eventually broke into a wide smile.

Osaka has openly talked about struggling with depression and working on her mental health since winning the 2018 US Open over Serena Williams.

She withdrew from last year's French Open, left last year's US Open in tears and was brought to tears again by the comment from a spectator at Indian Wells last month.

But in Miami, it was all happiness.

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"I want to dedicate this one to all the people that support me, my fans," Osaka said as she held the crystal runner-up trophy.

"I know I haven't been in this position for a little minute. I know this isn't the outcome you guys wanted, but I'm having fun up here."

Świątek also had kind words for Osaka after the match:

Świątek would still be number two in the rankings if Barty had not retired or had not asked to be removed from the list.

But the gap between one and two in that scenario would have been much closer — Barty led by Świątek by 2,204 points when the Miami Open began and would have seen that margin sliced down to 269 points on Monday.

The men's final in Miami is on Sunday when number six seed Casper Ruud will face number 14 Carlos Alcaraz.

AP