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17: Lionel Messi made his debut for Barcelona in October 2004 against Espanyol.
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18: Messi broke into the first team during the 2004-05 season and became Barcelona's youngest scorer in May 2005.
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19: He became a regular first-team player under Frank Rijkaard.
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20: Scored 17 goals in 36 games, including his first El Clasico hat-trick.
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21: Messi registered 16 goals in 40 games, but Barcelona failed to win any silverware.
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22: He was in sensational form during the 2008-09 season, recording 38 goals in 51 games as Barca won the Champions League.
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23: Barcelona won six trophies in 2009, with their star man netting 47 goals.
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24: Hit top form again as Barcelona stormed to a second Champions League win in three years under Pep Guardiola.
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25: Had a scintillating season in front of goal, scoring 73 times in 60 matches.
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26: Another outstanding season for the Argentine, netting 60 goals in 50 appearances.
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27: Messi overtook Paulino Alcantara's 369-goal record to become the club's leading goalscorer in all competitions.
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28: The Argentine became the all-time top scorer in La Liga and Champions League history.
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29: Messi won his fifth Ballon d'Or award after another devastating season.
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30: He clinched the European Golden Shoe award after scoring 54 goals in 52 games.
