Real 's unbeaten run stretches back to the 5 - 1 victory over Basel in their opening Champions League Group C game on 16 September .
Real 's unbeaten run surpasses the 18 - game mark set by Barcelona in 2005 - 06 season .
Real 's unbeaten run stretches back to the 5 - 1 victory over Basel in their opening Champions League Group C game on 16 September and surpasses the 18 - game mark set by Barcelona in 2005 - 06 season .