| Personal information | |||
|---|---|---|---|
| Full name | Federico San Emeterio Díaz | ||
| Date of birth | 16 March 1997 | ||
| Place of birth | Sierra de Ibio, Spain | ||
| Height | 1.74 m (5 ft 9 in) | ||
| Position | Central midfielder | ||
| Team information | |||
Current team | Ponferradina | ||
| Number | 6 | ||
| Youth career | |||
| Textil Escudo | |||
| 2007–2014 | Racing Santander | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) |
| 2014–2016 | Racing Santander | 69 | (1) |
| 2016–2018 | Sevilla B | 77 | (5) |
| 2018–2022 | Valladolid | 65 | (1) |
| 2018–2019 | → Granada (loan) | 36 | (2) |
| 2022 | → Cádiz (loan) | 12 | (0) |
| 2022–2025 | Cádiz | 59 | (1) |
| 2025– | Ponferradina | 23 | (0) |
| International career | |||
| 2015 | Spain U19 | 3 | (0) |
| * Club domestic league appearances and goals as of 25 May 2026 | |||
Federico "Fede" San Emeterio Díaz (born 16 March 1997) is a Spanish professional footballer who plays as a central midfielder for Primera Federación club Ponferradina.
Born in Sierra de Ibio, Mazcuerras, Cantabria, San Emeterio joined Racing de Santander's youth academy in 2007, aged 10. On 14 January 2014, before even having appeared with the reserves, he made his senior debut, coming on as a late substitute in a 2–0 away win against UD Almería for that season's Copa del Rey.
San Emeterio first appeared in the Segunda División B on 10 May, again from the bench in a 1–1 away draw with Coruxo FC. On 24 August he played his first match as a professional, replacing Javi Soria in the 64th minute of a 1–0 loss at Girona FC in the Segunda División.
San Emeterio contributed 35 appearances during the campaign, as his team suffered relegation. He scored his first senior goal on 4 October 2015, in a 2–0 victory at Sporting de Gijón B.
On 16 August 2016, both San Emeterio and his brother moved to another reserve team, signing a three-year contract with Sevilla Atlético in the second division. He netted three times from 39 games (all starts) in his second year, which ended in relegation after the last-place finish.
On 16 August 2018, San Emeterio joined Real Valladolid on a three-year deal, being immediately loaned to Granada CF in the second tier. He made his La Liga debut while at the service of the former club, starting the 1–1 away draw against Real Madrid on 24 August 2019.
On 6 January 2022, San Emeterio was loaned to top-flight side Cádiz CF until June, with a buyout clause. On 7 August, he agreed to a permanent four-year contract at the Nuevo Mirandilla.
San Emeterio all but missed the 2023–24 season, due to recurrent knee injuries. On 6 August 2025, he left by mutual consent.
San Emeterio's twin brother, Borja, is also a footballer. A defender, he too came through the ranks at Racing.
| Club | Season | League | National cup | Total | ||||
|---|---|---|---|---|---|---|---|---|
| Division | Apps | Goals | Apps | Goals | Apps | Goals | ||
| Racing Santander | 2013–14 | Segunda División B | 2 | 0 | 1 | 0 | 3 | 0 |
| 2014–15 | Segunda División | 35 | 0 | 0 | 0 | 35 | 0 | |
| 2015–16 | Segunda División B | 32 | 1 | 0 | 0 | 32 | 1 | |
| Total | 69 | 1 | 0 | 0 | 70 | 1 | ||
| Sevilla B | 2016–17 | Segunda División | 38 | 2 | — | 38 | 2 | |
| 2017–18 | Segunda División | 39 | 3 | — | 39 | 3 | ||
| Total | 77 | 5 | 0 | 0 | 77 | 5 | ||
| Granada | 2018–19 | Segunda División | 36 | 2 | 0 | 0 | 36 | 2 |
| Valladolid | 2019–20 | La Liga | 25 | 0 | 2 | 0 | 27 | 0 |
| 2020–21 | La Liga | 24 | 0 | 2 | 0 | 26 | 0 | |
| 2021–22 | Segunda División | 16 | 1 | 2 | 0 | 18 | 1 | |
| Total | 65 | 1 | 6 | 0 | 71 | 1 | ||
| Cádiz | 2021–22 | La Liga | 12 | 0 | 1 | 0 | 13 | 0 |
| 2022–23 | La Liga | 33 | 0 | 0 | 0 | 33 | 0 | |
| Total | 45 | 0 | 1 | 0 | 46 | 0 | ||
| Career total | 292 | 9 | 8 | 0 | 300 | 9 | ||