Hello and welcome to our live coverage of the first-leg of the Champions League semi-final between Borussia Dortmund and Real Madrid at Signal Iduna Park.

Wow wow wow wow. What a result. Dortmund were simply stunning. Can Madrid come back from here? Not likely. Let me know what you thought of the game on Twitter.

FULL TIME. A sensational win for Dortmund as they beat Madrid thanks to four, FOUR, goals from Robert Lewandowski. Ronaldo's reply gives Madrid a sliver of hope but it's a long shot now. Dortmund v Bayern in the final? It certainly looks that way.

CHANCE FOR MADRID! The ball drops perfectly for Varane but his volley on the turn flashes just wide of the post!

Late corner for Madrid....

Sergio Ramos booked for handball.

A change for Dortmund as the brilliant Gundogan is replaced by Julian Schieber.

Into injury time we go, Dortmund cruising to a sensational win.

Ouch. Weidenfeller has been hurt as he was caught by Ronaldo on the knee.

GOOD SAVE! Ronaldo is free in the box but his low effort is blocked by a fine save from Weidenfeller, who runs off his line to intervene.

So, Lewandowski MOM of course. But Reus has been electric and Gundogan authoritative in midfield. Goetze has been quiet, but he let others steal the limelight today.

Stat from Opta: "Borussia Dortmund last reached the semi-finals of the Champions League back in 1997/98. They were eventually knocked out by Real Madrid (2-0 on aggregate)."

Dortmund seeking to see the game out now. They will settle for a three-goal margin. What a chance they have of reaching the final.

And another change, Kevin Grosskreutz on for Piszczek.

Kuba is taken off after a purposeful performance, with defensive midfielder Sebastian Kehl on in his place to tighten things up for Dortmund.

Kaka comes on for Alonso as Madrid throw caution to the wind.

Ronaldo pings the ball wide to Di Maria but his attempted cross goes behind.

LEWANDOWSKI AGAIN! Lopez is forced into a smart save when the striker lashes one in from 25 yards. He looks like scoring every time he gets the ball.

Reus gets in behind and lobs Lopez to nestle the ball in the far corner, but he is caught offside. Replays show it was very close indeed.

Madrid sneak a pass through the Dortmund backline for Khedira but his cross is turned behind by Weidenfeller for a corner. Madrid don't make anything of it.

When you consider the Bayern score last night, this has been a truly monumental week for German football. No one does this to Barcelona and Real Madrid. No one.