How many Grand Slam titles did the winner of the 1980 Avon Championships of Houston win ? 
1980 Avon Championships of Houston:  Third-seeded Billie Jean King won the singles title and earned $30,000 first-prize money. Billie Jean King: Billie Jean King ("née" Moffitt; born November 22, 1943) is an American former World No. 1 professional tennis player.
i don't know