Stefanos Tsitsipas: I was very stressed during first set versus John Isner

Greek tennis star Stefanos Tsitsipas admitted that he was "very stressed" in the first set of his French Open third round clash against big-serving American John Isner. Tsitsipas, who is enjoying a career-high ranking of No. 5 in the world, recovered from a set down to beat Isner 5-7 6-3...