Nick Kyrgios has been slapped with a $US10,000 ($14,500) fine for ugly behaviour in his first-round match at Wimbledon when he spat towards a spectator.

The latest in several big-money fines this season for the Australian came, ironically, on Thursday (Friday AEST) after he had been on his best behaviour while producing one of his finest Wimbledon performances to knock out No. 28 seed Filip Krajinovic and roar into the third round.

AAP