Nick Kyrgios left court to smash two racquets in a bad-tempered Cincinnati Masters defeat by Karen Khachanov after which he called the umpire "a tool".
The Australian, 24, walked off court after losing the second set against the wishes of Irish umpire Fergus Murphy.
He slammed two racquets on the floor in a corridor and in the third set engaged in repeated disputes with Murphy.
Russia's Khachanov, 23, dominated the deciding set to win 6-7 (3-7) 7-6 (7-4) 6-2 and reach round three.
Khachanov, who plays Lucas Pouille in the last 16, said Kyrgios has "great talent" but "sometimes the head is not in the right place".