At Real Madrid, he played a pivotal role in helping the club win two consecutive Copa del Reys as he scored important goals in both finals.
In the following season, Pruden helped the club achieve promotion to Segunda División, the second tier in Spain, before the outbreak of the Spanish Civil War in 1936.
[4][9] Pruden made his debut for Madrid in the first round of the 1943 Copa del Generalísimo precisely against his former team Salamanca, and he scored a brace as they won 5–1.
[5] In the subsequent rounds, Real Madrid defeated RCD Español, Xerez and Barcelona with the historic 11-1 victory,[5] in which Pruden scored a hat-trick in the second leg of the semi-finals to help Madrid achieve the biggest win in the history of the El Clásico by either side, and reaching the final which they would lose to Athletic Bilbao.
[5][9] As a striker at Madrid, Pruden scored seven hat-tricks for a total of 87 goals, one behind the club's all-time top scorer at the time, Luis Regueiro from Irunda with 88.
[4] He was unable to earn a single cap for the Spanish national team because of the great competition that there was for the position of center forward, where mainly Mundo and Telmo Zarra blocked his way.
[5][9] After hanging up his boots, Pruden continued to practice medicine, and in 1953 he entered the medical services of Real Madrid.