Roger Federer says "now is the time" for the men's and women's governing bodies to merge while tennis is in limbo because of the coronavirus.
The 20-time Grand Slam champion floated the idea in a series of Twitter posts.
He said merger of the men's Association of Tennis Professionals (ATP) and the Women's Tennis Association (WTA) "probably should have happened".
"We can come out of this with two weakened bodies or one stronger body," Federer said.
Last year WTA president Micky Lawler said it should be seriously discussed.
In a series of social media posts on Wednesday, Federer added: "I am not talking about merging competition on the court but merging the two governing bodies that oversee the men's and women's professional tours.