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British number three Katie Boulter secured her seventh consecutive win on the WTA Tour as Camila Osorio retired during their second-round match at the Merida Open.
Boulter, who won the Ostrava Open this month, had taken the first set 6-3 in Mexico when Colombian Osorio called for the physio and decided not to continue.
World number 69 Boulter will face Italian top seed Jasmine Paolini or Australian Priscilla Hon in the quarter-finals on Friday.
"We really don't want to see women with injuries," Boulter said.
"It's been pretty tough recently. I've seen a lot of people with them and I've been through them myself, so I know how difficult it is."
Indian Wells, the third WTA 1000 tournament of the year, begins on 4 March in California.