Captain Sergio Ramos scored a stoppage-time equaliser to extend Real Madrid's unbeaten start to the season and deny Barcelona victory in a bad-tempered El Clasico. Luis Suarez's glancing header from Neymar's left-wing free-kick put Barcelona ahead at the Nou Camp. But in a frantic ending, Cristiano Ronaldo went close before Ramos headed home Luka Modric's free-kick to earn a point for Zinedine Zidane's La Liga leaders. Leaders Real remain six points clear of defending champions Barca after 14 matches.