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The battle between managers was won by Jurgen Klopp for most of this match, just like the first leg.
Despite having much less depth and a weaker squad, the German coach had his team more prepared for battle than his Portuguese counterpart.
Round 1: Klopp
Dortmund knew they had arguably the best attack in the world to stop and shut them out for really the entire match. The first goal came from a defender on a cross and the second from a free kick,
Gonzalo Higuain and Cristiano Ronaldo were shut down after some outstanding play from Hummels, Subotic and Dortmund's two defensive midfielders—and later Sven Bender.
The general strategy worked perfectly. Klopp trusted his great defense without completely shutting down the attack and had his midfield perfectly set up to beat Los Merengues on the counter.
Die Borussen showed the Spaniards how to execute a counter and really embarrassed the fullbacks for most of the night.
For the first half, Mourinho got it wrong. He allowed Madrid to open up far too much and left the game far too narrow going forward—this was as much because of the poor showings from Angel di Maria and Ronaldo.
Round 2: Mourinho
In the second half, momentum completely switched.
Real didn't come out much more aggressively than in the first half, but Klopp appeared less concerned with clinching the win with another goal.
The pressure from Dortmund's midfield was far less prevalent and they were content to just soak up Madrid's attack.
The first 10 minutes after the break were almost all Madrid and the Germans rarely even touched the ball.
This was not a great strategy from Klopp, but the big shift came in the last 15 minutes when Mourinho decided to take a big risk.
With the attack stalling and Dortmund playing less aggressively and less direct, the Portuguese manager made a change that could have been a disaster.
He took Arbeloa off for Kaka, leaving the left flank—which had been destroyed by Reus all night—wide open with only Essien shifted that direction for extra cover.
Decisive Round: Mourinho
In the end, the move proved brilliant as Madrid were attacking almost non-stop in the last 10 minutes while Klopp was fine with just closing up shop and trying to see the game out.
Instead, Klopp perhaps should have tried attacking more or at least getting more possession.
Since he didn't, the few times Dormtund did venture forward saw Madrid looking very threatening on the counter despite usually having fewer numbers.
This relentless attack caused some nervousness at the back for Dortmund which led to too many fouls behind given. It was one of those fouls that ended up leading to Ozil's equalizer.
By the time Die Borussen did start attacking more often, it was just minutes from the final whistle and too late.
What's worse is that even that final bit of attack nearly proved fruitful as the Germans continued to beat Ramos out wide and almost got the winner in extra time.
If Klopp had just kept that attack up more consistently, the rather awful Madrid defense was likely to concede again.
Instead, it was Mourinho's aggressive changes and late tactics that won out.