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In page Julio César Chávez:

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Chávez made his professional debut at age 17. In his 12th fight, on March 4, 1980, Chávez faced Miguel Ruiz in Culiacán, Sinaloa. At the end of the first round, Chavez landed a blow that knocked Ruiz out. Delivered as the bell sounded, the blow was ruled a disqualification in the ring and Ruiz was declared the winner. The next day, however, his manager, Ramón Felix, consulted with the Mexican boxing commission, and after further review, the result was overturned and Chávez was declared the winner.[citation needed]