Rossana de los Ríos born September 16, 1975 is a professional tennis player from Paraguay. As of June 14, 2010, she is ranked World No. 92 on the Sony Ericsson WTA Tour. She was born in the Paraguayan capital, Asunción, and now lives in Miami, USA, with her 10-year-old daughter Ana Paula Neffa de los Ríos and her husband Gustavo Neffa, a retired Paraguayan football (soccer) player who used to play for the Boca Juniors. Rossana achieved a career high singles ranking of No. 51 in September 2001, and has been as high as No. 52 in doubles.
As a 14-year-old, De los Ríos played just three matches, and won the first match of her career on the ITF circuit in Sao Paulo. In 1990 she played twelve matches, winning won six of them. In May 1991, she won her first ever ITF title, in Francaville, and the next month lost the final in Modena. In September, she won her second ITF title, in Lima, without dropping a set; her win/loss record for the year was 40-18. The following year, she won her third title, in Santa Maria Capua Vetere in October, where she beat Silvia Farina Elia. The following week she reached the final in Asunción, and then the final in Mildura. Her win/loss record for the year was 34-19. As well as being the world number one junior in 1992 and won the 1992 Junior French Open, beating Paola Suárez 6–4 6–0 in the final. In 1993 she made the final in Caserta in June as she turned professional. As the world number 118, she caused a big upset at the Puerto Rican Open by defeating top seed and world number 30 Brenda Schultz-McCarthy in the first round, finishing the year with 20 wins and 18 losses. In 1994, she only played until April, and won only two of ten matches before retiring to start a family
De los Ríos got married to Gustavo Neffa, and gave birth to Ana-Paula on January 17, 1997. She returned to the WTA Tour in June 1999, after a five-year absence. In just her fifth tournament back, she won her fifth ITF title, in Buenos Aires, dropping just nine games in five matches. Her win/loss record for the year was 31-9.