Saturday's U.S. Open women’s singles championship match will be a fairy tale ending no matter who wins. The finalists are 19-year-old Leylah Fernandez, of Canada, and 18 -year-old Emma Raducanu, of Britain, both of whom were relatively unknown just a couple of weeks ago. Stacey Allaster, the U.S. Open tournament director, joins John Yang to discuss.

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