King's husband Larry co-founded World Team Tennis in 1973 with Dennis Murphy, Jordan Kaiser, and Fred Barman and WTT began in 1974. The couple used their savings to put on a team tennis event at the Oakland Coliseum. King remained involved with World Team Tennis for decades, eventually sharing ownership with her ex-husband, her life partner Ilana Kloss and USTA. In 2017, King sold her majority ownership stake of the league to Mark Ein and Fred Luddy. WTT was based on her philosophy for gender equality and it had been running continuously for over 40 years.