John McEnroe refused to answer a question about Serena Williams' possible retirement after her Wimbledon defeat on June 18.

What happened?

McEnroe was asked if Williams had played her last singles match, but he didn't feel comfortable giving a response.

Why it matters for John McEnroe

The question was put to McEnroe live on air, and he replied: "You think I know? Come on, don't ask me a question that's unanswerable."

What comes next?

Williams walked off Centre Court, giving a big hand to the crowd, possibly for the last time, as she may return in doubles with sister Venus.

The same question was put to American pundit Tracy Austin, before McEnroe interjected and said: "I never thought that she would come back in the first place, but go ahead Tracy..."

Austin explained: "I think we have got to celebrate Maya Joint now and celebrate Serena coming back."

Joint then walked over to the podium to begin her speech, revealing how she felt after beating one of the greatest tennis players of all time.

“I don’t know what to say right now," Joint said in her on-court interview. "Wow. I don’t know what just happened to be honest."

When asked about the most difficult part of playing an icon such as Williams, Joint replied: “I think just trying to come out on court and play a match against her."

Williams suffered a heartbreaking three-set defeat to Maya Joint at Wimbledon, finishing with a score that marked a potential end to her singles career.

The crowd gave Williams a standing ovation as she walked off the court, honoring her legacy in the sport.

McEnroe's refusal to comment on Williams' retirement sparked interest, as he is known for his candid opinions on tennis.

Williams' return to professional tennis almost four years after stepping away was a significant moment in the sport.

Her potential retirement would mark the end of an era in women's tennis, as she is considered one of the greatest players of all time.

The tennis world will be watching to see if Williams returns in doubles with her sister Venus, or if this is indeed the end of her singles career.