Dayana Yastremska arose from her sleep in Odessa, Ukraine one night in late February, the sound of the bombs rippling through her body. "You kind of think it's a dream," she tells TIME. "Then you realize it's reality." Russia had begun its invasion of her country. A day later Yastremska, the 93rd-ranked women's tennis player in the world, and her sister Ivanna, a junior player, hugged their father goodbye in Izmail, where a boat was waiting to take the sisters across the Danube river to Romania.