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Incensed at being warned for coaching, as she felt her character was being called into question, she initially made her point forcefully - but politely - to Carlos Ramos. Many umpires might have turned a blind eye, as the rule is widely flouted, but Williams' coach Patrick Mouratoglou has admitted he was trying to send her a message.

When Williams broke her racquet in anger, Ramos had no alternative. A warning is followed by a penalty point.

This is when the 36-year-old started to lose her cool. Jabbing her finger angrily in Ramos' direction, she called him a liar and a thief and suggested she would make sure he never umpired any of her matches again. Anything that questions an umpire's honesty has to be penalised and credit to Ramos for having the courage to make that call against the greatest player of all time as she chased history on home soil.