The 1990s tennis champ is Monica Seles, a professional tennis player from Yugoslavia who won eight Grand Slam singles titles during her career. She was the youngest ever French Open champion at the age of 16 in 1990 and was ranked World No. 1 in 1991 and 1992. Seles was known for her aggressive style of play and her powerful two-handed backhand. She was also the first female athlete to earn more than $5 million in prize money.