Andrey Rublev has been disqualified from the Dubai Tennis Championships for unsportsmanlike conduct.
The Russian second seed screamed in the face of a line judge following a disputed call in the third set of his semi-final with Alexander Bublik.
A Russian-speaking official told ATP supervisor Roland Herfel that Rublev had sworn at the line judge in Russian.
Rublev denied he was speaking Russian, but was defaulted for unsportsmanlike conduct by umpire Miriam Bley.
The world number five, who was trailing 6-5 in the final set, will lose all of his prize money and ranking points for the week.