Austin turned professional in October 1978. That same month, she won her first professional singles title, defeating Betty Stove in the final of the Porsche Tennis Grand Prix in Filderstadt, West Germany. Austin defeated 35-year-old Billie Jean King in the quarterfinals of the 1979 Wimbledon Championships before losing to Martina Navratilova in straight sets in the semifinals. Austin then became the youngest ever US Open champion, aged 16 years and 9 months, by defeating Navratilova in the semifinals and Chris Evert in the final. Evert had been attempting to win the title for the fifth consecutive year. Earlier that year, Austin ended Evert's 125-match winning streak on clay by beating her 6-4, 2-6, 7-6 in a semifinal of the Italian Open. The Associated Press named Austin its Female Athlete of the Year for 1979. Austin lost in the semifinals of both Grand Slam tournaments she played in 1980. Evonne Goolagong Cawley, seeded fourth and the eventual champion, defeated Austin at the Wimbledon Championships. As the top seed and defending champion at the US Open, Austin was expected to extend her five-match winning streak against third-ranked Evert. Austin took a 4-0 lead in the first set before Evert won 16 of the final 20 games to win the match. Evert went on to beat Hana Mandlikova in the final, thus securing for herself the year-ending World No. 1 ranking. Austin was ranked the World No. 1 singles player in 1980 for two weeks (April 7-20) and then for nineteen weeks (July 7-November 17), partly because she captured the two sponsors' tour-ending events. Austin defeated Navratilova to win the Avon Championships in March and Andrea Jaeger to capture the 1980 Colgate Series Championships in January 1981. In 1980, Austin won the Wimbledon mixed doubles title with her brother John, becoming the first brother and sister team ever to win a Grand Slam title together.

Answer this question "did she set any records?" by extracting the answer from the text above.
Austin then became the youngest ever US Open champion, aged 16 years and 9 months,