Messi Barcelona career in season 2008 - 2009

Upon Ronaldinho's departure from the club, Messi inherited his number 10 jersey. During this season he placed second in the 2008 FIFA World Player of the Year awards with 678 points.

Messi scored his first hat-trick of 2009 in a Copa del Rey tie against Atlético Madrid which Barcelona won 3–1. Messi scored another important double on 1 February 2009, coming on as a second half substitute to help Barcelona defeat Racing Santander 1–2 after being 1–0 down. The second of the two strikes was Barcelona's 5000th league goal. On 8 April 2009, he scored twice against Bayern Munich in the Champions League, setting a personal record of eight goals in the competition.

As Barcelona's season was drawing to a close, Messi scored twice (his 35th and 36th goals in all competitions) to cap a 6–2 win over Real Madrid at the Santiago Bernabéu in what was Real's heaviest defeat since 1930. He won his first Copa del Rey on 13 May, scoring one goal and assisting another two, in a 4–1 victory over Athletic Bilbao. He helped his team win the double by winning La Liga. On 27 May he helped Barcelona win the Champions League by scoring a second goal in the 70th minute giving Barcelona a two goal lead; he also became the top scorer in the Champions League, the youngest in the tournament's history, with nine goals. Messi also won the UEFA Club Forward of the Year: and the UEFA Club Footballer of the Year rounding off a spectacular year in Europe. This victory meant Barcelona had won the Copa del Rey, La Liga and Champions League in the one season, and was the first time a Spanish club had ever won the treble. Messi finished the season with 38 goals and 18 assists in all competitions.

Lionel Messi football career in FC Barcelona

Messi played in Barcelona's junior Infantil B and Cadete B & A teams from 2000 to 2003 (scoring 37 goals in 30 matches in Cadete A). Season 2003–04 saw him on a record five different teams: He started one match in Juvenil B (one goal) and got promoted to Juvenil A (14 matches, 21 goals). Later he debuted for FC Barcelona C team (Tercera División) on 29 November 2003 and for FC Barcelona B (Segunda División B) on 6 March 2004. He played for both teams during the season (eight matches, five goals and five games, zero goals, respectively). Even before these two debuts, Messi made his official debut for the first-team on 16 November 2003 aged 16 years and 145 days, in a friendly match against Porto.

Less than a year after his start, Frank Rijkaard gave him his league debut against RCD Espanyol on 16 October 2004 (at 17 years and 114 days), becoming the third-youngest player ever to play for Barcelona and youngest club player who played in La Liga, which would be broken by Bojan Krkić in September 2007. When he scored his first senior goal for the club against Albacete Balompié on 1 May 2005, Messi was 17 years, ten months and seven days old, becoming the youngest to ever score in a La Liga game for Barcelona until it was again broken by Bojan Krkić in 2007, scoring from a Messi assist. Messi said about his ex-coach Rijkaard: "I'll never forget the fact that he launched my career, that he had confidence in me while I was only sixteen or seventeen." During the season, Messi played also in Barcelona B (Segunda División B) scoring 6 goals in 17 matches.