Sergio Leonel "Kun" Agüero del Castillo born 2 June 1988 is an Argentine footballer who currently plays for Atlético Madrid and the Argentina. Agüero earned his nickname Kun when his grandparents noted his resemblance to Japanese anime character Kum Kum. He is engaged and has a son with Diego Maradona's daughter Giannina Maradona. Sergio Agüero started playing for Club Atlético Independiente, becoming the youngest player to debut in the Argentine First Division at 15 years and 35 days, breaking the record held by Diego Maradona in 1976. Agüero with Atlético Madrid. In May 2006 Agüero signed for Spanish club Atlético Madrid for an undisclosed fee, reported to be around €23 million, breaking the club's previous transfer record. He has played for Atletico Madrid since 2006 appearing 151 times scoring 56 times. He has scored 9 times in 25 appearanes for Argentina.