| 2ª B G2 | 24/11/13 | Athletic Club B | - | Real Unión | 1:1 | ||||
| 2ª B G2 | 26/10/14 | Real Unión | - | Athletic Club B | 1:1 |  |
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| 2ª B G2 | 05/11/16 | Real Unión | - | Athletic Club B | 3:1 | ||||
| 2ª B G2 | 02/04/17 | Athletic Club B | - | Real Unión | 1:2 |  |
|
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| 2ª B G2 | 02/09/17 | Athletic Club B | - | Real Unión | 4:0 |
| Iker Undabarrena Martínez | |
| Born: | 18.05.1995 |
| Place of birth: |
Gorliz, 
Spain |
| Nationality: |
Spain
|
| Height: | 181 cm |
| Weight: | 77 kg |
| Position(s): | Central Midfielder Defensive Midfielder |
| Foot: | right |
