Stefanos Tsitsipas can take as long as he likes in the bathroom now with no complaints after his shock US Open loss to a foe in the flush of youth.

The Greek third seed was stunned by 18-year-old Spaniard Carlos Alcaraz 6-3, 4-6, 7-6 (7/2), 0-6, 7-6 (7/5) in a third-round match at Arthur Ashe Stadium, Tsitsipas having never reached the last 16 at the US Open.