Gustavo Alfonso Ayón Aguirre (born April 1, 1985) is a Mexican professional basketball player for Real Madrid of the Liga ACB and the EuroLeague. He also represents the Mexican national basketball team in international national team competitions. Standing at 6 ft 10 in (2.08 m), he plays at the center and power forward positions. Ayon was an All-EuroLeague Second Team selection in 2016.

Ayón attended Universidad Popular Autónoma del Estado de Puebla in Mexico for three years of college. He was named Most Valuable Player of the Mexican national college championship tournament in leading the team to the championship. Following this season, he signed with NCAA Division I San Jose State University. However, Ayón never played for the Spartans, instead choosing to sign with a Mexican professional team, Halcones UV Xalapa.

In the 2006 season, Ayón saw some action off the bench for Halcones UV Xalapa as the team finished second in the Liga Nacional de Baloncesto Profesional. Ayón cracked the starting lineup the following season and eventually led Halcones to back-to-back Mexican league titles in 2007–08 and 2008–09. He averaged 10.2 points and 8.1 rebounds per game in 2007–08 and improved on that by averaging 13.2 points and 7.8 rebounds per game the following season. In what turned out to be his final game for the team, Ayón turned in a dominant, 24-point, 20-rebound, performance in leading his club to a 94–90 overtime victory over Soles de Mexicali that clinched their second consecutive league title.

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