World No 1 Ashleigh Barty retained her Miami Open title after opponent Bianca Andreescu was forced to retire injured in the second set of Saturday's final.
Former US Open champion Andreescu lost the opening set 6-3 and was then broken twice to fall 4-0 down in the second to the world No 1.
The 20-year-old Canadian had gone over on her ankle during game two of the second set and needed treatment from the physiotherapist at courtside but soon called it a day in emotional circumstances.
She had returned to action after a 15-month injury layoff at the Australian Open in February - but after playing a follow-up event in Melbourne - Andreescu had to withdraw from tournaments in Adelaide, Doha and Dubai with a leg issue.
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Andreescu said she has wanted to play Barty for a long time and was glad to finally have her chance in their first career meeting, but the Australian, herself battling a suspected abdominal injury, imposed her game from the start of the match and deservedly won the first set.
She then won four-straight games in the second before her opponent walked broke down in tears as she was forced to concede defeat and hand Barty the title.
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It was a second WTA Tour triumph of 2021 for the Australian, and her 10th career title.
Andreescu's run to the final is projected to move her up three spots in the WTA rankings to world No 6.
Because the pandemic reduced tournament revenue and severely limited attendance, the champion received $300,110, compared with the $1.35m Barty won in 2019. Only 750 fans were allowed on the grounds per session.
In the men's doubles final, the all-British pairing of Dan Evans and Neal Skupski finished as runners-up to Nikola Mektic and Mate Pavic, losing 6-4 6-4.
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