Belarusian Aryna Sabalenka, the top seed, reached the last 16 of the Miami Open when Romanian qualifier Elena-Gabriela Ruse retired at the Hard Rock Stadium on Saturday.
Sabalenka, ranked No 1, led 6-1, 0-0 when Ruse, ranked No 102, pulled out with a right thigh injury.
The Belarusian will face the winner of the match between Swiss qualifier Rebeka Masarova and American Danielle Collins, the No 14 seed, next.
Aryna Sabalenka defeated Bulgarian Viktoriya Tomova (6-3, 6-0) ahead of her victory.
Earlier in the tournament, the Romanian won against Russian Polina Kudermetova (6-1, 6-7 (5), 6-2) and Pole Magdalena Frech, the No 29 seed (6-4, 6-4).
Miami WTA 1000, other third-round results (Hard Rock Stadium, hard, USD 8.963.700, most recent results first):
- Qinwen Zheng vs. Taylor Townsend
- Elise Mertens vs. Iga Swiatek
- Karolina Muchova vs. Elina Svitolina
- Clara Tauson vs. Paula Badosa
- Madison Keys vs. Alexandra Eala
- Anna Kalinskaya vs. Jessica Pegula
- Anna Blinkova vs. Marta Kostyuk
- Amanda Anisimova vs. Mirra Andreeva
- Emma Raducanu vs. McCartney Kessler
- Rebeka Masarova vs. Danielle Collins
- Magda Linette vs. Linda Fruhvirtova
- Coco Gauff vs. Maria Sakkari
- Hailey Baptiste vs. Naomi Osaka: saturday
- Ashlyn Krueger beat Leylah Fernandez (26): 6-1, 7-5
- Jasmine Paolini (6) beat Ons Jabeur (31): 4-3 ret.
