Sergio Martínez Mantecón (born 8 June 1980) is a Spanish professional footballer who plays for Cádiz CF as a defensive midfielder.
Born in Madrid, Mantecón finished his formation with local giants Real Madrid, but made his senior debuts with CD Badajoz's reserve team. On 3 January 2001 he played his first professional game with the latter's main squad, coming on as a second-half substitute in a 0–4 home loss against Racing de Santander for the season's Copa del Rey; he finished the league campaign with eight Segunda División appearances.
In the following two years Mantecón was a regular starter for the Extremaduran side, being relegated in 2003. In August of that year he joined Alicante CF in Segunda División B, appearing twice in the promotion playoffs but falling consecutively short.
On 29 June 2006 Mantecón moved to Hércules CF, in the second division. After being regularly used in his first season he was left out of the squad in his second, and subsequently joined third level's SD Ponferradina in January 2008.
Do you know you steal my breath
Make me feel I'm second best
Hold me up at gunpoint whisper in my ear
Just a narcissistic crush
That doesn't seem to matter much
'Til I find that you're here
Even when you're not
You mean so much
Coz all I've got is your touch
All I've got is your touch
Do you know how juvenile
I feel when you make me smile
I'm above you but I love to be brought down
And if only you'd resist
All the boundaries that exist
I could look you in the eye and tell you now
You mean so much
Coz all I've got is your touch