Canada’s Bianca Andreescu reached the round of 16, losing 6-4, 6-4 to Sofia Kenin of the United States.
The 22-year-old Ontarian got the job done in an hour and 34 minutes, leading 3-1 for breaks and 7-1 for aces.
Ranked 31st in the WTA, Andreescu reached the round of 16 in Miami for the third time in as many tournament appearances.
Andreescu will take on the 18th seed Ekaterina Alexandrova on Monday night.
The 28-year-old Russian ruled out ninth-seeded Belinda Bencic.
Olympic gold medalist in Tokyo, Bencic was beaten 7-6 (8), 6-3.
Alexandrova saved four set points in the first set, en route to her 10th career win over a top-10 player.
Andreescu won the US Open in 2019.
She and Alexandrova never crossed swords.
On the men’s side, Denis Shapovalov of Ontario lost 6-4, 6-4 to 10th-seeded Taylor Fritz of the United States.
Shapovalov had 12 aces, but he ran his doom by committing seven double faults.
World No. 1 Carlos Alcaraz also advanced on the board, winning 6-0, 7-6(5) ahead of Serbian Dusan Lajovic.
Alcaraz scored all three aces in the game, en route to a 16th win in 17 matches this season. His next opponent will be the American Tommy Paul.
“I feel fast on the court, I move well,” said Alcaraz, quoted by the ATP website. I’m happy with the diversity of my shots. I have fun every moment during the matches. »
World number 2 Aryna Sabalenka is featured in the evening, opposite Czech Marie Bouzkova.
Monday afternoon, Leylah Fernandez will play doubles with Taylor Townsend, against Beatriz Hadda Maia and Giuliana Olmos.