The bullet strike from Asensio and close-range finish from Benzema added to the three goals netted at Camp Nou a few days ago, meaning a comfortable 5-1 aggregate victory.
Barca were the better side in the second half, hitting both the crossbar and post, but in the end it just was not to be as Ernesto Valverde made it back-to-back defeats to being his reign.
Relive how the 90 minutes of action unfolded with Sports Mole's live text coverage below.
STARTING XI: Navas; Carvajal, Ramos, Varane, Marcelo; Modric, Kovacic, Kroos; Vazquez, Benzema, Asensio
SUBS: Casilla, Nacho, Bale, Casemiro, Hernandez, Isco, Ceballos
STARTING XI: Ter Stegen; Pique, Mascherano, Umtiti; Roberto, Gomes, Busquets, Rakitic, Alba; Messi, L.Suarez
SUBS: Cillessen, Semedo, D.Suarez, Deulofeu, Alcacer, Digne, Vidal
© Getty Images
REAL MADRID SUBS: Casilla, Nacho, Bale, Casemiro, Hernandez, Isco, Ceballos
BARCELONA SUBS: Cillessen, Semedo, D.Suarez, Deulofeu, Alcacer, Digne, Vidal