How did it start?
Serena Williams was unhappy to be given a code violation for coaching early in the second set. Players are not allowed to receive coaching from anyone in the stands and umpire Carlos Ramos saw Williams's coach Patrick Mouratoglou making a gesture.

Coach admits to tips
Yes, Mouratoglou admitted to ESPN that he was coaching, but claimed all coaches do it, something that is widely accepted but inconsistently penalised. Williams told Ramos she would rather lose than cheat. The American is one of the few players never to call their coaches on court, which is allowed on the WTA Tour, and said they had never discussed hand signals.