Marta Kostyuk ended a convincing win with an underarm ace — but this tennis mic-drop is also just a good tactic.

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 ...

Kostyuk is a Style Points favorite for a reason, and her new pink and purple ombre tennis kit is fit for Tennis Paradise. She’s been rocking Wilson’s Headliner Tennis Dress, which features a ...