This Wednesday, January 9, Real Madrid will try to avenge the loss to Celta Vigo in the first leg of their Copa del Rey tie.
Despite being outplayed for the entire match, a late goal from Cristiano Ronaldo probably saved the tie by keeping the deficit at just one goal.
Los Merengues could move on to the Round of 16 if they score just one goal and keep the Galicians out of goal.
The reigning league champions will be heavy favorites going in, even with all of their internal problems.
The Santiago Bernabeu is one of Europe's most historic stadiums. The awe of looking at the famous white jerseys while tens of thousands of fans are behind them can shake even the best footballer.
Still, Os Celeste have the one-goal advantage and can definitely walk away with the huge upset.
Here are four reasons to think it could actually happen when they head to the Spanish capital this Wednesday.