Gibson's ATA success drew the attention of Walter Johnson, a Lynchburg, Virginia, physician who was active in the African American tennis community. Under Johnson's patronage—he would later mentor Arthur Ashe as well—Gibson gained access to more advanced instruction and more important competitions, and later, to the United States Lawn Tennis Association (USLTA, later known as the USTA). In 1946 she moved to Wilmington, North Carolina, under the sponsorship of another physician and tennis activist, Hubert A. Eaton and enrolled at the racially segregated Williston Industrial High School. In 1949 she became the first Black woman, and the second Black athlete (after Reginald Weir), to play in the USTA's National Indoor Championships, where she reached the quarter-finals. Later that year she entered Florida A&M University (FAMU) on a full athletic scholarship and was a member of the Beta Alpha chapter of Alpha Kappa Alpha sorority.