The WTT Pro League presented by GEICO will celebrate its 37th season of play this year. Billie Jean King and Larry King created the unique gender-equity team concept in the early 1970s. The WTT Pro League first hit the courts in 1974 for a five-year run. After a short hiatus, the League returned in 1981 and has been a highlight of the annual U.S. tennis calendar for the past 31 consecutive years. (from World Team Tennis Website). New for this year – an iPhone App.