MADRID (AP) — Real Madrid, a team known and feared for producing epic Champions League comebacks, needs to deliver its biggest one yet to keep its title defense alive on Wednesday. The record 15-time European champions are staring at a 3-0 deficit to Arsenal heading into the second leg of the quarterfinals at the Santiago Bernabeu stadium.

Real Madrid will meet Arsenal in the UEFA Champions League quarterfinal this afternoon. Here's what you need to know.

Arsenal advanced to the Champions League semifinals for the first time since 2009 with a 5-1 aggregate victory over Real Madrid, beating the reigning champions 2-1 at the Santiago Bernabéu on Wednesday night.