The incident occurred after Daniil Medvedev so that Stefanos Tsitsipas won the break in the 9th game of Set 2. This is the game that the No. 2 seed player is not good. He made up to two double errors thereby losing his own advantage.
Before Medvedev made the second double serve mistake, Mr. Apostolos Tsitsipas (the father of Stefanov Tsitsipas) 'reminded her' for his son. The action of Mr. Apostolos Tsitsipas is illegal because the coach is not directly offered tactical instructions when a game is going on.

Disformed with what just happened, Daniil Mevdevdev argued with the referee with a fierce attitude. He asked the referee to deduct points for Stefanos Tsitsipas but were not approved.
The loss of break causes Medvedev to be taken by Tsitsipas with a score of 5-4. In the game later, despite saving up to 2 set points, it was not enough for the No. 2 seed to avoid failure.

Also in the last game of Set 2, Stefanos Tsitsipas continued to talk with his father. This action caused the Greek player to be warned by the referee.
Losing set 2 but Medvedev won 2 sets 3 and 4 to close the 2nd semi-final of the men's singles of the Australian Tournament expanded 2022 with a score of 3-1. He became the opponent of Rafael Nadal in the final. In the first semi-final, Nadal surpassed Metto Berrettini with a score of 3-1 after nearly 3 hours of competition.