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|Full name||Sergio Martínez Mantecón|
|Date of birth||8 June 1980|
|Place of birth||Madrid, Spain|
|Height||1.77 m (5 ft 9 1⁄2 in)|
|Playing position||Defensive midfielder|
|* Senior club appearances and goals counted for the domestic league only|
Born in Madrid, Mantecón finished his formation with local giants Real Madrid, but made his senior debut with CD Badajoz's reserves. On 3 January 2001 he played his first professional game with the latter's first team, 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 signed with 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.
Mantecón agreed to a two-year contract with CD Castellón on 24 June 2008. After experiencing another team relegation in 2010, he joined fellow league club Elche CF in the off-season; after starting in 25 of his 39 matches in the 2012–13 season, as they returned to La Liga after more than two decades, he signed a new one-year deal with the Franjiverdes.
On 19 August 2013, 33-year-old Mantecón made his debut in the Spanish top flight, replacing David Generelo midway through the second half of a 0–3 away loss against Rayo Vallecano. After only 12 appearances and two starts during the campaign, he was released in June 2014 and moved to Cádiz CF in the third level.