The Los Angeles Open was a former tennis tournament held in Los Angeles, United States from 1927 until 2012. It included a women's draw until 1974 when Linda Lewis won the last ladies title. Subsequently, it became a men-only event and integrated into the ATP's professional tennis circuit. The inaugural edition of the event, known as the Pacific Southwest Championships, was organized by Perry T. Jones and held at the Los Angeles Tennis Club (LATC) starting in October 1927. Bill Tilden and Kea Bouman were the first singles champions. The tournament quickly became a prestigious event on the tennis calendar.

Cornelia "Kea" Tiedemann-Bouman was a female tennis player from the Netherlands. She won the singles title at the 1927 French Championships, beating Irene Bowder Peacock of South Africa in the final. Bouman was the first and, to this date, the only Dutch woman who has won a Grand Slam singles title.