Borja San Emeterio

Racing

Born in Sierra de Ibio, Mazcuerras, Cantabria, San Emeterio joined Racing de Santander's youth system in 2007, aged 10. He made his senior debut with the reserves in the 2014–15 season, in the Tercera División. San Emeterio played his first match as a professional on 16 November, starting in a 0–0 Segunda División away draw against CD Lugo.

Sevilla

On 16 August 2016, San Emeterio and his brother moved to another reserve team, signing a three-year contract with Sevilla Atlético in the second division. After being rarely used in his first year he featured more regularly in the second, with the latter season ending in relegation.

Lugo

San Emeterio joined Lugo on a three-year deal on 1 August 2018. The following 23 January, he was loaned to Cultural y Deportiva Leonesa of the third tier until June. On 12 July 2019, San Emeterio moved to CD Atlético Baleares in the same league and also in a temporary deal. Upon returning, he terminated his contract on 7 September 2020.

Numancia

On 7 September 2020, just hours after leaving Lugo, San Emeterio signed a two-year deal with recently relegated side CD Numancia. He achieved promotion to Primera Federación in 2021–22, being immediately relegated the following campaign.

As of match played 21 March 2021

San Emeterio's twin brother, Federico, is also a footballer. A midfielder, he too was developed at Racing.

Spain U19

UEFA European Under-19 Championship: 2015