In 1940 a group of Gibson's neighbors took up a collection to finance a junior membership and lessons at the Cosmopolitan Tennis Club in the Sugar Hill section of Harlem. At first, Gibson didn't like tennis, a sport she thought was for weak people. "I kept wanting to fight the other player every time I started to lose a match." In 1941 she entered—and won—her first tournament, the American Tennis Association (ATA) New York State Championship. She won the ATA national championship in the girls' division in 1944 and 1945, and after losing in the women's final in 1946, won her first of ten straight national ATA women's titles in 1947. "I knew that I was an unusual, talented girl, through the grace of God," she wrote. "I didn't need to prove that to myself. I only wanted to prove it to my opponents."