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SAN DIEGO — Unseeded Katie Boulter of England capped a run of upsets to win the San Diego Open singles title with a 5-7, 6-2, 6-2 victory over sixth-seeded Marta Kostyuk of Ukraine. A 10-year tour veteran, the 28-year-old Boulter won her second pro singles title with her fifth straight victory over higher-seeded players in the week-long WTA 500 event. Boulter improved to 6-1 against seeded opponents this year.







