Asked what happened, Tsitsipas smiled as he admitted: “I have no idea.”
The world No 4, who has been known to receive coaching violations more often than most during his matches, admitted this one came as a surprise.
“I was laughing because it was funny because of the position of the court that I was at,” he continued, explaining his on-court reaction.
“I was really far away from my coach, and with my back facing the other way, so I was just laughing because I don’t know where that came from. It was completely unexpected.”