This is the injury Tsitsipas is suffering from: "He starts the match at a disadvantage"

The physio of the Greek team spoke about the Stefanos Tsitsipas' injury: "His back problem is in the rehabilitation phase. He is following a rehabilitation protocol as prescribed by the doctor who recently treated him," told Tennis24. "It is a complicated injury. Basically, the main discomfort Stefanos is currently experiencing is during serving. When an athlete of Stefanos's caliber has so much discomfort in the serve, which is one of his main weapons, he starts the match at a disadvantage."

This is an automatic translation. You can read the original news, Así es la lesión que sufre Tsitsipas: "Empieza el partido con desventaja"