In late 1958, having won 56 national and international singles and doubles titles, Gibson retired from amateur tennis. Prior to the Open Era there was no prize money at major tournaments, and direct endorsement deals were prohibited. Players were limited to meager expense allowances, strictly regulated by the USTA. "The truth, to put it bluntly, is that my finances were in heartbreaking shape," she wrote. "Being the Queen of Tennis is all well and good, but you can't eat a crown. Nor can you send the Internal Revenue Service a throne clipped to their tax forms. The landlord and grocer and tax collector are funny that way: they like cold cash ... I reign over an empty bank account, and I'm not going to fill it by playing amateur tennis." Professional tours for women were still 15 years away, so her opportunities were largely limited to promotional events. In 1959 she signed to play a series of exhibition matches against Fageros before Harlem Globetrotter basketball games. When the tour ended she won the singles and doubles titles at the Pepsi Cola World Pro Tennis Championships in Cleveland, but received only $500 in prize money.