Tennis officials will dish out stricter punishments for on-court misconduct, the ATP warned players in an internal note on Monday as the men's governing body also simultaneously reviews its guidelines to clamp down on repeat offenders.
Australian maverick Nick Kyrgios was fined $60,000 for a series of angry outbursts at the Indian Wells and Miami Open events, with many observers saying he should have been disqualified.
German Alexander Zverev was thrown out of a tournament in Acapulco in February after smashing his racket repeatedly against the umpire's chair following a doubles defeat.