Barcelona's Brazilian midfielder Philippe Coutinho reacts during the Spanish 'Copa del Rey' (King's cup) quarter-final second leg football match between FC Barcelona and RCD Espanyol at the Camp Nou stadium in Barcelona on January 25, 2018. Pic/ AFP

Lionel Messi scored what proved to be the winner as Barcelona beat Espanyol 2-0 to reach the Copa del Rey semi-finals on Thursday in a game that saw Philippe Coutinho make his long-awaited debut. Luis Suarez scored an early opener in the quarter-final second leg before Messi's deflected effort gave Barcelona a 2-1 aggregate advantage as the holders overturned a 1-0 deficit from last week's first leg. Messi had missed a penalty in that match as the leaders of La Liga were beaten for the first time since August, but they did enough on Thursday to join Sevilla, Valencia and Leganes in Friday's draw for the last four.