Serena Williams' outburst during the US Open Final yesterday is still on everyone's lips today.

The tennis veteran lost to Naomi Osaka as a result, but the 20-year-old's first grand slam win has been overshadowed by the drama over Williams.

Williams accused the umpire of sexism, claims that have been backed up the head of the Women's Tennis Association.

However, Williams coach has admitted he was coaching from the sidelines, which sparked the first code violation.

Radio Sport's tennis commentator Matt Brown told Larry Williams says that the code violations were against the rules.

"She came across to me as petulant, almost a bully out on court, and disguising the fact she was playing poorly and being well beaten."

Brown says that the umpire, Carlos Ramos, is well known for being strict around the rules.

LISTEN TO MATT BROWN TALK WITH LARRY WILLIAMS ABOVE