Francisco Olegario Segura (June 20, 1921 – November 18, 2017), better known as Pancho "Segoo" Segura, was a leading tennis player of the 1940s and 1950s, both as an amateur and as a professional. In 1950, 1951, and 1952, as a professional, he was the world No. 1 player in the USPLTA rankings. He was born in Guayaquil, Ecuador, but moved to the United States in the late 1930s and after acquiring U.S. citizenship in 1991 was a citizen of both countries. Throughout his amateur career he was listed by the USTA as a "foreign" player resident in the U.S. He is the only player to have won the Cleveland/Forest Hills US Pro and International Pro titles on three different surfaces (which he did consecutively from 1950–1952).