Emma Raducanu defeats Marta Kostyuk at the DC Open and will face Naomi Osaka next

Emma Raducanu has handed No. 7 seed Marta Kostyuk her sixth consecutive loss. Raducanu defeated Kostyuk 7-6 (4), 6-4 at the DC Open on Tuesday. Kostyuk’s winless slide now has lasted more than two months. This was the fifth tournament…