Daniil Medvedev lost his temper with Australian Open opponent Maxime Cressy, embarking on a furious on-court rant about his rival's playing style.
The Russian is the bookies' favourite to win the Melbourne tournament in the absence of world-number one Novak Djokovic, and has gone well so far.
He had only dropped one set in his opening three matches, and only Nick Kyrgios had given him any real resistance in the first week of action Down Under.
