Pro tip for all future Serena Williams interviewers ... whatever you do, do NOT ask about her friend Meghan Markle ... 'cause you WILL get shut down.
The tennis superstar faced the media after her Australian Open match on Monday ... and the first question wasn't about her win over Anastasia Potapova, it was about Megxit.
“Your good friend, Meghan Markle, who attended your last 2 slams, and Harry, have taken a move, a stance that many people think is extraordinary and historic," the reporter said.
"What are your feelings about that?