A rather harsh pair of yellow cards for Alejandro Arribas changed the game early, but it is Lionel Messi's four-goal performance that will be the talk of the town tonight.
Cristiano Ronaldo's hat trick brought him within eight goals of Messi earlier in the day, but Messi took a big step forward in the Pichichi race just hours later.
Barcelona 5-1 Osasuna
Red Card: Arribas
Barcelona: Valdes, Alves, Puyol, Mascherano, Adriano, Busquets, Xavi, Thiago, Pedro, Messi, Villa
Osasuna: Andrés Fernández, Marc Bertrán, Arribas, Flaño, Nano, Lolo, Raoul Loe, Oier, Cejudo, De las Cuevas, Llorente