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,

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.