W ASHINGTON — Emma Raducanu handed No. 7 seed Marta Kostyuk a sixth consecutive loss Tuesday, defeating her 7-6 (4), 6-4 at the DC Open to prolong a slide that now has lasted more than two months.

Emma Raducanu secured an impressive straight-sets win over seventh seed Marta Kostyuk in Washington as she looks to build ahead of the US Open.

Emma Raducanu is relishing the chance to face Naomi Osaka after setting up a blockbuster first meeting in Washington. Playing her first match since she pushed Aryna Sabalenka in the third round of Wimbledon,