MADRID (Reuters) - The 168th La Liga "Clasico" between in-form Real Madrid and an erratic Barcelona could see the table-toppers take a big step towards winning the title and sound the death knell for the champions bid for a fifth triumph in six years.
Leaders Real host their arch rivals at the Bernabeu on Sunday (2000 GMT) in one of soccer's most emotive occasions, featuring a clash of the world's two richest clubs, the two best players - Real's Cristiano Ronaldo and Barca's Lionel Messi - and watched by hundreds of millions around the world.
