Britain's Katie Boulter is through to the Miami Open third round after teenage opponent Brenda Fruhvirtova was forced to pull out through illness.
Boulter, who is Britain's leading women's player after a strong start to 2024, led 7-6 (7-5) 1-0 when 16-year-old Fruhvirtova decided to stop.
After leading by an early break, the Czech started to suffer physically and twice asked to see a doctor.
"To win like that, I'll take it but I want her to get better," said Boulter.
"Playing against a struggling opponent is one of the toughest things to do, seeing her coaches telling her to pull out and she was still going.