Little sister, you're on notice! Zoryana Kostyuk is reaping the rewards of being her big sister Marta Kostyuk's lucky charm this week at the Mubadala Citi DC Open. The elder Kostyuk is through to ...
Coco Gauff had won her three previous meetings against Marta Kostyuk on hardcourts, and the American had taken her last 17 ...
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