|Full name||Sergio Matabuena Delgado|
|Date of birth||12 February 1979|
|Place of birth||Santander, Spain|
|Height||1.85 m (6 ft 1 in)|
|2000–2001||→ Velarde (loan)|
|* Senior club appearances and goals counted for the domestic league only.
Matabuena was born in Santander, Cantabria. A product of hometown Racing de Santander's youth system, he made his debut in La Liga on 17 November 2002 in a 1–2 home loss against RCD Mallorca, and scored his first goals in the following season.
Never an undisputed starter, Matabuena would be a mere training partner upon Gonzalo Colsa's return to Racing in 2006 and, after only five appearances during 2006–07, he moved to Sporting de Gijón in the second division, being instrumental in helping it achieve a 2008 top flight return. In a campaign in which he collected 14 yellow cards (also netting two late goals in a 2–2 draw at Córdoba CF), he earned the affectionate nickname "Matabuena Gattuso".
Matabuena appeared significantly less in the following top level seasons – namely only 14 matches in 2009–10 – being only second or third-choice holding midfielder. On 13 January 2011, at nearly 32, he returned to the second level and signed for Real Valladolid.
- El Mallorca agranda su récord (Mallorca extends record); El País, 18 November 2002 (in Spanish)
- Atlético, punto y seguido (Atlético, check please); Mundo Deportivo, 21 December 2003 (in Spanish)
- La 'bestia' Baptista se come al Racing ('Beast' Baptista eats Racing up); Mundo Deportivo, 19 April 2004 (in Spanish)
- Matabuena salva al Sporting en Córdoba (Matabuena rescues Sporting in Córdoba); Marca, 6 January 2008 (in Spanish)
- ´Gattuso´ logra el doctorado (´Gattuso´ gets Ph.D.); La Voz de Asturias, 16 May 2009 (in Spanish)
- Matabuena rescinde su contrato con el Sporting para fichar por el Valladolid (Matabuena terminates his contract with Sporting to sign for Valladolid); ABC, 13 January 2011 (in Spanish)