Club Career

Kaká began his club career with São Paulo at the age of 8. He signed a contract at 15 and led the SPFC youth squad to Copa de Juvenil glory. In 2000, the club was set to sell Kaká to Turkish 1st division side Gaziantepspor, who turned down the deal after refusing to pay a price of $1.5m for him. Kaká made his São Paulo senior debut in January 2001 and scored 12 goals in 27 appearances, in addition to leading São Paulo to its first and only Torneio Rio-São Paulo championship. He scored 10 in 22 matches the following season, and by this time his performance was soon attracting attention from European clubs.

AC Milan, fresh from winning the UEFA Champions League 2002-03, brought him aboard in 2003 for $8.5 million, a fee described in hindsight as "peanuts" by club owner Silvio Berlusconi. Within a month, he cracked the starting lineup, and has remained there since. His Serie A debut was in a 2-0 Milan win at A.C. Ancona. He scored 10 goals in 30 appearances that season, as Milan won the Scudetto and the European Super Cup.

Kaká was an integral part of the five-man midfield in the 2004-05 season, usually playing in a withdrawn role behind striker Andriy Shevchenko. He scored 7 goals in 36 domestic appearances as Milan finished runner-up to Juventus. Despite Milan losing the 2004-05 Champions League final to Liverpool F.C. on penalties, he was nonetheless voted the best midfielder of the tournament, and also finished ninth, with 19 votes, in the running for the 2005 Ballon D'Or.

The 2005-06 season saw Kaká score his first hat-tricks in domestic and European competition. On April 9, 2006, he scored his first Rossoneri hat-trick against Chievo Verona. All three goals were scored in the second half. Seven months later, he scored his first Champions League hat-trick in a 4-1 group stage win over RSC Anderlecht. The football world was beginning to take notice of a superstar in the making. Following Rui Costa's departure to Benfica at the end of the season, and despite the insistence of many Milan fans, Kaká turned down the chance to switch from his number 22 to the now-vacant #10, a number typically associated with world-class scorers. (The number was eventually claimed by teammate Clarence Seedorf.)

Shevchenko's departure to Chelsea FC for the 2006-07 season allowed Kaká to become the focal point of Milan's offense as he alternated between the midfield and striker positions. He finished as the top scorer in the 2006-07 CL campaign with ten goals, which proved a huge catalyst in steering Milan back to European success. One of them helped the Rossoneri squeak by Celtic FC 1-0 after extra time in the quarterfinals on a 1-0 aggregate, and three others proved fatal for Manchester United in the semifinals despite Milan losing the first leg. Following the convincing 3-0 second-leg defeat at the San Siro on May 2 that knocked out the English champions, Manchester United manager Sir Alex Ferguson declared that Kaka was one of the two best players in the world, alongside his charge Cristiano Ronaldo. The previous month, a panel of experts set up by Italian publication Gazzetta dello Sport proclaimed Kaká as the world's best footballer. Shevchenko also included his endorsement, while suggesting that Kaká deserved to win the Ballon d'Or.

Kaká added the Champions League title to his trophy case for the first time when Milan defeated Liverpool F.C. 2-1 in Athens on May 23, 2007. Though he went scoreless, he won a free kick that led to the first of Filippo Inzaghi's two goals, and provided the assist for the second. For his stellar play throughout the competition, he was voted the Vodafone Fans' Player of the Season in a poll of over 100,000 UEFA.com visitors. In June 2007, German football publication Kicker named him the world's best player, with Cristiano Ronaldo and Ronaldinho finishing second and third, respectively, while he was also given this honor by UK publication The Times.