[1] A product of hometown RCD Mallorca's youth ranks, he first appeared officially with the first team on 17 April 2005 in a 0–0 La Liga home draw against Valencia CF,[2] and established himself as a useful attacking player in the following seasons.
[3] In the second half of 2007–08 campaign, Casadesús served a six-month loan at Segunda División club Real Sociedad,[4] scoring regularly during his stint but not being able to help the Basques ultimately promote to the top flight.
He returned subsequently to the Balearic Islands but, in August 2008 was again loaned, to Gimnàstic de Tarragona also in the second tier,[5] being again recalled after netting a career-high 13 goals.
[7] On 14 January 2010, he helped the team come from behind against Rayo Vallecano with a brace for an eventual 3–1 home win (4–3 aggregate), but had to be stretchered off with a broken clavicle.
[13] Casadesús appeared for Spain at the 2004 UEFA European Under-19 Championship, scoring for the eventual champions in the 2–2 semi-final draw with Ukraine (penalty shootout victory after 120 minutes).