At Ajax he was voted as the club's brightest emerging talent in 2003/2004. As a result he made his appearance in Ajax's first team squad for the 2004/2005 season, making his Eredivisie debut against Roda JC on 27 February 2005 in a 1-2 away win. Just weeks after his Eredivisie debut he was called up to the national team, making his debut against Romania in March 2005.
During the 2005/2006 season he became a first team regular and he won his first career trophies, starting with the 2005 Johan Cruijff-schaal and the 2006 KNVB Cup.
Valencia CF
After helping to win the Johan Cruijff-schaal for the third consecutive time at the start of the 2007/2008 season, Maduro joined La Liga's Valencia C.F. on 18 January 2008. He was brought in under Ronald Koeman.
After Koeman's dismissal, as well as Maduro coming back late from the Olympics, he only played a very small role for Valencia in the beginning of his second season there. However, under this new coach Unai Emery, Maduro came into the squad due to injuries and suspensions and performed at various positions. Playing in midfield, central defense, and even as a right back. After a while Maduro displayed a clear progression in his play and turned into a regular for Valencia. Eventually he was used more frequently as a central defender, being preferred instead of Carlos Marchena or Alexis. It became his regular position, where he showed impressive displays against Barcelona and Real Madrid partnerring with Spanish international Raul Albiol.
International Career
He was called up for the 2006 FIFA World Cup and featured in one match against Argentina.
Despite already having amassed 12 senior caps, in 2007 he took part in the 2007 UEFA European Under-21 Football Championship in the Netherlands, and also scored the competition's first goal when Jong Oranje beat Israel 1-0. He also played in their second match against Portugal (2-1 win) to secure a semi final spot and to qualify for the 2008 Summer Olympics. In the semi finals against England the score was 1-1 after 120 minutes, in the following penalty shootout with 32 kicks taken, the Dutch reached their second straight final winning the shootout 13-12. The Dutch went on to retain their 2006 title by beating Serbia 4-1 in the final. After the tournament he was named in the 'UEFA Team of the tournament'.
After an extended absence from the national team, Maduro was called in for a friendly match v Ukraine in August 2010. He played the entire second half in defensive midfield.
