This happened at the end of the third set in the duel with Aleksandar Bublik, with a score of 1-1 in sets and 6-5 for Rublyov. The reason for the disqualification was insults uttered in Russian after the tennis player had remarks on a line judge’s decision. Because of that, he got in his face and started yelling at him, and the other linesman, who knew Russian, signaled that Rublyov was insulting, i.e. cursing.