Top seed Ashleigh Barty of Australia retained her Miami Open title after her Canadian opponent Bianca Andreescu was forced to retire with an ankle injury.
The Australian world number one was leading 6-3 4-0 in the first meeting between the pair.
The 2019 US Open champion had treatment from the trainer after she fell in the third game of the second set but was unable to complete the match.
Barty had broken her opponent early in both sets and controlled the match after that, moving her opponent around the court.
She held serve in the opening game of the match and immediately broke before going 3-0 up.
Although the Canadian took advantage of an erratic service game from Barty to break back and close the deficit to 3-2, it was only a temporary reprieve as the Australian broke in the next game and continued to exert her dominance again to take the set.
Andreescu was soon under pressure in the second set, suffering an early break to go 2-0 down before the injury soon brought a disappointing end to her tournament.