Boxing for the Citadel Cadets, Lempesis was a two-time Southern Conference Welterweight Champion. Lempesis was known as the “fastest boxer in the south” and compiled a career record of 50 wins in 51 bouts. “The Gloved Greek” also won the first Charleston Golden Gloves Tournament as a lightweight in 1937. After tremendous publicity and a letter-writing campaign to The News and Courier in Charleston, Lempesis planned to box in the 1941 collegian nationals, but the NCAA declared him ineligible because of his AAU-sanctioned Charleston Golden Gloves appearance in 1937. He was inducted into the Citadel’s Athletic Hall of Fame in 1961. A private pilot, he became a lawyer after hanging up his gloves.