Tennis-Steely Tsitsipas keeps cool to beat Isner in four sets

Tennis - French Open - Roland Garros, Paris, France - June 4, 2021 Greece's Stefanos Tsitsipas in action during his third round match against John Isner of the U.S. REUTERS/Sarah Meyssonnier

PARIS (Reuters) - Fifth seed Stefanos Tsitsipas was handed his first real test at this year's French Open before he subdued big-serving American John Isner 5-7 6-3 7-6(3) 6-1 to move into the fourth round on Friday.

The 22-year-old, who won two titles on clay in the run-up to Roland Garros, had to endure a torrid serving barrage in the opening set but eventually found his stride to set up a fourth round clash with Spanish 12th seed Pablo Carreno Busta.