Karim Benzema struck a hat-trick as Real Madrid thrashed arch-rivals and league leaders Barcelona 4-0 to reach the Copa del Rey final in stunning fashion on Wednesday. Barca, bidding for a fourth successive Clasico victory this season, looked set for the final having edged a 1-0 win in the first leg of the semi-final in Madrid last month. But after dominating the early stages of the second leg they fell apart in unlikely fashion to lose 4-1 on aggregate with Benzema becoming the