On 20 October 1976, 15-year old Diego Maradona became the youngest player in Argentina's Primera División history when he made his professional debut for Argentinos Juniors in a home match against Talleres de Córdoba.
With Argentinos trailing 1-0, he entered the match as a substitute in the 46th minute, wearing the number 16 shirt. Maradona was still 10 days away from his 16th birthday at the time.
Argentinos lost the match, 1-0, but Maradona would go on to make an additional 166 appearances for Argentinos from 1976-80, scoring 115 goals. In 1981, he transferred to Boca Juniors for £1 million. Coincidentially, Maradona's debut for Boca was also against Talleres, but that time his side emerged 4-1 winners.
Maradona's record as the youngest player to appear in the Primera División lasted until 7 July 2003, when Sergio Agüero debuted for Independiente at the age of 15 years, 35 days.