Guillermo Romero Luna
- Bats Left, Throws Left
- Height 6' 0", Weight 168 lb.
- Debut April 20, 1954
- Final Game April 20, 1954
- Born June 25, 1930 in Tacubaya, Distrito Federal Mexico
- Died November 9, 2021 in Los Mochis, Sinaloa Mexico
Pitcher Memo Luna played in just one major league game but had a professional career that lasted nearly twenty years and earned him a spot in the Salon de la Fama in Mexico.
After starting his pro career as a teenager, Luna had a huge year for the Tijuana Potros of the Southwest International League in 1951, going 26-13 while leading the circuit with a 2.52 ERA and 318 strikeouts. With the San Diego Padres two years later, he went 17-12 while leading the Pacific Coast League with a 2.67 ERA.
Following his successful season with the Padres, Luna's contract was purchased by the St. Louis Cardinals. He made his big league debut on April 20, 1954, starting against the Cincinnati Redlegs. However, he did not make it out of the 1st inning, walking two and giving up two hits and two earned runs before being replaced by Mel Wright with two outs. After that one outing, he was sent to the Rochester Red Wings, never to return to the majors again.
Luna continued playing pro ball through 1962. He was elected to the Salón de la Fama in 1987.