Real Madrid's players celebrate with the trophy after winning their King's Cup final soccer match against Barcelona at Mestalla stadium in Valencia April 20, 2011. [Photo/Agencies]

VALENCIA, Spain - Real Madrid claimed their first trophy under Jose Mourinho in dramatic fashion when Cristiano Ronaldo's extra-time winner secured a 1-0 King's Cup final victory over arch-rivals Barcelona on Wednesday.

With penalties looming in a tense and occasionally brutal clash at a festive Mestalla stadium in Valencia, the Portuguese forward leaped to crash home a 103rd-minute header from Angel Di Maria's superb centre after regular time had ended in stalemate.

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Real's first domestic cup since 1993 in Mourinho's debut season since joining from Inter Milan denied Pep Guardiola's Barca, who lead La Liga by eight points, the chance of a second treble in three seasons.

Their first silverware after two barren seasons also gives Real a lift ahead of their two-legged European Champions League semi-final against Barca on April 27 and May 3.

"Winning a trophy is always good," a weary-looking Mourinho, who was criticised by honorary Real president Alfredo Di Stefano after Saturday's 1-1 La Liga draw with Barca at the Bernabeu, said at a news conference.

"I try to do my work as well as possible and I am tired now but very pleased," added the 48-year-old.

"It gives me some tranquility, nothing more, and I will continue with my work."

Mourinho, who won the King's Cup in 1997 and 1998 as assistant to Barca coaches Bobby Robson and Louis Van Gaal, has now won cups in four different countries following triumphs in his native Portugal with Porto, in England with Chelsea and in Italy with Inter.

"In my opinion it was a great football match," he said. "I think we played well against a great team and beating a great team has more value."

Real Madrid's captain and goalkeeper Iker Casillas lifts up the trophy in front of Spain's King Juan Carlos (bottom R) after winning the King's Cup final soccer match against Barcelona at Mestalla stadium in Valencia, April 20, 2011. [Photo/Agencies]