sentences:  In 1915, the national championship was relocated to the West Side Tennis Club in Forest Hills, Queens, New York City.The effort to relocate it to New York City began as early as 1911 when a group of tennis players, headed by New Yorker Karl Behr, started working on it.In the first years of the U.S. National Championship, only men competed and the tournament was known as the U.S. National Singles Championships for Men.