It is one of the biggest career wins for the Ipswich product who defeated the No.5 seed 7-6(1) 6-3 for the first time in five attempts.

Her win over the Czech is the third over a top-10 player at this tournament, having beaten both No.7 seed Kiki Bertens and third seed Petra Kvitova.

โ€œItโ€™s been a phenomenal two weeks,โ€ Barty said.

โ€œI feel a turning point for me was at Wimbledon last year and Iโ€™ve been playing some great tennis since then.โ€

It is the biggest victory for an Australian since Sam Stosur's 2011 US Open win and will see Barty pocket US$1.35 million.

The Queenslander dominated the game through her service game, finishing the match with 15 aces but her shorts from the baseline also helped Barty overcome the 2016 US Open Finalist in straight sets.

It was a mammoth opening game of the second set before Barty was broken. However, she was able to work her way back into the contest from 3-1 down and won 86 percent of her first-service points.

Barty became the fifth different Miami Open womenโ€™s champion in the past five years.