Nick Kyrgios of Australia had an exchange of words with Irish umpire Fergus Murphy during his First Round Singles Match against Roberto Carballes Baena of Spain during day four of the Fever-Tree Championships at Queens Club in London last June.
Murphy eventually responded by handing Kyrgios a point violation after Khachanov won the second-set tiebreaker to level the match, when the Canberran overstepped the mark by screaming out an obscenity.
Kyrgios has been fined $A167,000 by the ATP.
It's the latest meltdown in the tempestuous career of the talented but troubled 24-year old. The tour also said it is investigating whether "additional action is warranted under the Player Major Offense section of the code", which could result in an additional fine and/or a suspension.
It all started when Kyrgios was given a time violation in the second set, a decision he certainly disagreed with.
Kyrgios carried out constant verbal abuse against the Irishman, calling him a potato and the worst umpire in the world.
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While Kyrgios was still capable of wowing the crowd with the occasional victor in the third set, his focus was gone and he conceded a break in the sixth game by attempting a tweener drop volley.
He left the court and smashed at least one racquet before, appeared to spit at the umpire and then when the match was over he called him a "fucking tool bro" before refusing to shake his hand.
Kyrgios received a fine for leaving the court because he said he was "going to the bathroom" before immediately smashing his racquets in the hallway.
Kyrgios has a history of conflict with Murphy - though that is far from the extent of his abusive on-court antics.
"It's really tough (playing Kyrgios), not only for me but for everybody".
German legend Boris Becker said he was saddened by Kyrgios's behaviour.
Russian eighth seed Khachanov kept his own cool throughout the histrionics and ended the match by winning three straight games to set up a meeting with France's Lucas Pouille for a place in the quarter-finals.