MADRID (AFP) - Lionel Messi grabbed a hat-trick as Barcelona responded emphatically to questions over their motivation by demolishing Osasuna 8-0 in a staggering display of attacking football at Camp Nou on Saturday. Messi scored his first goal after just five minutes as the Spanish and European champions rebounded from two successive draws to deliver the perfect response to critics who claimed they had become complacent with success. Cesc Fabregas, playing in attack with Pedro Rodriguez rested, soon scored their second before David Villa rounded the keeper just after the half hour mark and slotted home. An own-goal from Ruben Gonzalez added to Osasunas misery and Messi was on target again before the break. There was no drop in pace this time from Barca as in their games against Real Sociedad and AC Milan, and they continued to punish Osasuna. Xavi lobbed the keeper and then Villa and Messi both struck again to wrap up the scoring. A Frederic Kanoute goal after half-time gave Sevilla a 1-0 win over Real Sociedad in Saturdays late game. The Andalusian side dominated but found it difficult to break down a determined Sociedad. Alvaro Negredo and Jesus Navas both went close in the first half but it wasnt until the 53rd minute they finally made the breakthrough with Kanoute firing in a knock down from Negredo. A poachers goal from in-form Roberto Soldado gave Valencia a 1-0 win over Sporting Gijon to maintain their 100 per cent start to the season. Sporting, who are still to pick up a point, started strongly with plenty of possession but it was Valencia who took the lead through Soldado who has now scored five of Valencias six goals so far. Sloppy defending from the home defence gave Jonas Goncalves plenty of time to shoot but while the keeper Juan Pablo saved well.