A TENNIS star won a match with an underarm serve that aced her opponent. Ukrainian Marta Kostyuk progressed to the Miami Open Round of 16 with a 6-2 6-1 win over Russian Anna Blinkova. Kostyuk ...

And then there's Marta Kostyuk. The 17-year-old Ukrainian and her little sister Zoryana have been keeping their competitive spirit alive, to say the least: The rules were simple: slam the pad ...

Instead, it was the little white dress worn by tennis player Marta Kostyuk, one of the top-ranked Ukrainians on tour, that made the most buzz. At a tournament where a strict all-white dress code ...

Marta Kostyuk closed out her third-round win at the Miami Open with one of the most unexpected shots of the season -- an ...