She has the most Slams in singles (24--11 Australian, 5 French, 3 Wimbledon, and 5 U.S., with two additional U.S. amateur titles), and she also has the most combined in singles, doubles and mixed. I don't recall the number in all, I think it's around 56, a little ahead of Martina Navratilova. She won the Grand Slam in Singles in 1970 and Mixed Doubles with Ken Fletcher I think in 1963. She also won three out of four in 1973 towards the end of her career. Her head to head against Billie Jean King is well in her favor, I think it's 20-something to 10, but I'm guessing at that. King was considered her greatest rival, but King was injured a lot then so her record is a little looked down on versus King. While her record in Singles is often put down or overlooked because 7 of her 11 Australian titles (1960-1966) came when most top players didn't play there, she did win those tournaments. I think she took a couple of years off in the late 1960's to have a baby or two, but returned to win her Grand Slam in Singles. She's been compared as the women's Pete Sampras. She was a serve and volleyer and I think tall and athletic. I never saw her play.
Anyway, if you watched the 1999 French Open final, she was the trophy presenter. She has apparently become extremely religious in the last 10-20 years, and I think she's even a minister and runs a church in Australia, where she is from. We're talking a real Bible thumper, not the subtle kind. I read in "Hard Courts" she publicly ragged on Martina Navratilova after the latter's 1990 Wimbledon win as a poor role model for your girls because of her lesbianism. So, you can imagine, Margaret is not real popular these days. I don't think she's involved in tennis much and does not do any commentating as far as I know. She is in her late 50's. She did appear at the Wimbledon parade of champions in 2000.
She played Bobbie Riggs before Billie Jean King did and lost badly on Mother's Day and it was dubbed "The Mother's Day Massacre." When Billie Jean King found out, she said: "I knew I had to do two things. One, I had to play Bobbie Riggs. Two, I had to beat him." She did!
That's all I know.