The second leg of the Champions League quarter-finals will be played again on April 16 and 17, including the most anticipated match, Real Madrid vs Arsenal.
Madrid lost 3-0 at Arsenal in the first leg on Wednesday and are now at home in the Santiago Bernabeu, looking to turn things around.
Carlo Ancelotti's side must win by four goals to progress to the semi-finals.
In contrast, Arsenal only need to draw or lose by no more than two goals to progress to the top four, to match their 2009 achievement.
Meanwhile, Bayern Munich visited Inter Milan's home ground at Giuseppe Meazza, trailing 1-2 from the first leg.
Harry Kane et al must at least win by a margin of two and not concede a goal, in order to advance to the last four. However, Inter Milan is confident of maintaining their home advantage.
Meanwhile, Barcelona, who won 4-0 in the first leg over Borussia Dortmund, are the favorites to advance to the semifinals.
Dortmund will need the full support of their fans to turn things around in the second leg at Signal Iduna Park.
Aston Villa host French giants Paris Saint Germain, who hold a 3-1 lead, with Villa looking to spring an upset on the English side.