“That’s what umpires do all year,” the coach said, “and it would have ended there, and we would have avoided a drama that was totally avoidable.”

Williams approached the chair to tell Ramos that it was a “thumbs-up” gesture and that she would never accept coaching on court, which is against the rules of Grand Slam events.

“I don’t cheat to win,” she said in a stern tone. “I’d rather lose.”

During the next changeover, tensions seemed to simmer down during a civil exchange when Williams explained to Ramos that she understood he might have interpreted some coaching, but that none actually existed.

Williams went back on court, held her serve in that game, and then broke Osaka’s serve to take a 3-1 lead in the second set. If she could have consolidated that break, it might have turned the flow of the match. But Osaka broke right back, and after the game ended, Williams destroyed her racket by throwing it to the court in anger.

That resulted in a racket abuse penalty, a second code violation, for which the penalty is a point. Osaka would start the next game ahead by 15-0.

When Williams realized that, she argued more and demanded that Ramos apologize to her and make an announcement to the crowd that she was not receiving any coaching. Ramos, known for his no-nonsense approach, did not relent.