Tsitsipas created a ruckus
No stranger to timed bathroom breaks, Tsitsipas walked off the court to regroup but was visibly upset when he returned.
He broke again in the third game of the fourth set when Sinner dropped a misjudged drop-shot.
Tsitsipas’ lead was erased, pushing a backhand return into the tramlines on set point.
For all that, the match was suddenly within reach of the Greek as Sinner double-faulted and fired a forehand long blast in the fourth game to serve up three break points.
Tsitsipas flung one away with a clunky backhand return, then watched others slip through his fingers as Sinner canceled them out with raw power and an ace.
The Greek shook off the blow and had another three break points as Sinner wavered again in his next service game.
The Italian saved two but bowed out on the third, sending a forehand long to hand the momentum back to Tsitsipas.
The Greek reached for her most trusted weapon to close out the match with a flurry of first serves.
Asked how he came through the falter, Tsitsipas offered a technical adjustment, saying he loosened his wrists to generate more power and accuracy on the serve.
“It helped me to complete it well till the end without any tension,” he added.
“I’m glad I figured it out.”