The sports star called the Republican presidential primary candidate's forehand "ugly" and compared his tennis skills to his politics.
Navratilova suggested that tennis star Osaka's success may have come too fast, and that tennis players need to work to "stay in the moment."
The tennis star said she will retire after this summer's U.S. Open, which would mean she can't tie or pass Margaret Court's record of Grand Slam singles titles.
"I was 11...playing a tournament in Pilsen. In the morning [my father] called the house and said, "Don't go outside. Russian tanks are outside." So of course we went outside, yelled and screamed and threw rocks.
The 18-time Grand Slam winner criticized the U.S. Centers for Disease Control and Prevention for changing its guidelines after pressure from President Donald Trump.
The 24-time Grand Slam winner also said she would boycott Qantas because of the airline's support of gay marriage.
Court refused to fly on Qantas due to its support of same-sex marriage.
The British number one says his rival's theories are flawed.
The "Fawlty Towers" actor weighed in after the resignation of Raymond Moore.
The American is one major behind the retired star.