Real Madrid's star striker Cristiano Ronaldo reacts after missing a goal during the Spanish League  match against Deportivo Alaves at Mendizorroza Stadium in Vitoria, Spain on Saturday. Pic/AFP

Borussia Dortmund will aim to maintain their unbeaten record at home to Real Madrid in the Champions League tonight and spoil Cristiano Ronaldo's 150th European appearance. Dortmund and title holders Real meet in the group stage for the second year running.