L-R: Tennis champion Bill Tilden, Charlie, Douglas Fairbanks & Spanish tennis player Manuel Alonso, August 1923

Tilden was a friend of Charlie's for many years. His career ended in scandal in the 1940s after he was arrested for soliciting an underage male prostitute. Following his incarceration, Tilden was shunned by most of Hollywood but Charlie decided to help his friend by allowing him use his tennis courts to give lessons. Oona Chaplin was one of his students.