The 6'3", 210 lb Calderón spent his first six seasons playing in Europe. He made his
Spanish league debut playing for
CB Lucentum Alicante, and helped them win the league championship.
[1] He switched teams to
Baloncesto Fuenlabrada in the 2001–02 season, but seeing his playing time curtailed, he moved again the next season to
TAU Cerámica.
[1] There, Calderón played behind former NBA guard
Elmer Bennett at point for most of the season, and in the 2003–04 season, he won the
King's Cup with TAU Cerámica.
[1] In 2005, he led TAU Cerámica to the
Euroleague Final Four, where they finished second.
Calderón was part of the Spanish national team which finished fifth at the
2002 World Championships and second at the
2003 European Championships.
[1] He was later named the team captain during the
2004 Summer Olympics,
[1] and on
3 September 2006, Calderón and his Spanish squad defeated
Greece, and won the
2006 FIBA World Championship along with future Raptors teammate,
Jorge Garbajosa.
[1] In
EuroBasket 2007, Calderón and Garbajosa again featured for the Spanish team. In the knockout stages, Calderón recorded a game-high 17 points as Spain defeated
Germany 83–55 in the quarter-finals.
[17] In the semi-finals, Calderón scored 18 points in Spain's defeat of
Greece.
[18] The Spaniard led his team in points again in the final, but Spain lost 60–59 to
Russia.
[19]