Wightman was elected treasurer of the United States Lawn Tennis Association in 1917, but resigned the following year after he entered into active military service. He was elected secretary of the organization after
the war, but stepped down in 1921 due to business obligations. He was elected vice president of the organization in 1923 was, for all practical purposes, the head of the organization after president
Dwight F. Davis became
United States Assistant Secretary of War. Shortly after his election, the USLTA passed a player-writer rule that prevented players from receiving monetary compensation for writing articles on tennis tournaments they were competing in. The rule caused
Vincent Richards and
world's number 1 ranked player Bill Tilden to quit the
Davis Cup team. Wightman, who wanted to keep tennis an amateur sport, supported the rule, writing that "our amateur rule provides that "a person shall cease to be an amateur – by pursing, or assisting in the pursuit of tennis – as a means of livelihood or for gain or any emolument." Your president believes that the player-writer interpretation of the foregoing provision is entirely sound, and furthermore that it is absolutely necessary if the game of tennis is to continue an amateur sport". He did not run for reelection in 1925 due to business considerations. ==Boston Athletic Association==