Barcelona's Uruguayan forward Luis Suarez celebrates after scoring during the Spanish 'Copa del Rey' (King's cup) first leg semi-final football match between FC Barcelona and Valencia CF at the Camp Nou stadium in Barcelona on February 01, 2018. Pic/AFP

Luis Suarez headed in the only goal as defending champions Barcelona edged Valencia 1-0 in their Copa del Rey semi-final first leg at a half-full Camp Nou. Barcelona, the record 29-time winners of the tournament, are attempting to become the first team to lift the cup four years in a row since Athletic Bilbao in the 1930s.