Madrid went on to win the title with Carlo Ancelotti, the current Bayern coach, in charge at the time.
However the score could have been well different if Vidal would not have missed the penalty at the last minute before the break when Bayern led 1-0. a 2-0 lead going into the second half would have been much different.
Ronaldo reached 50 goals in April 2013 after 96 matches that was despite only scoring once in his first 32 European appearances for Sporting CP and United. We got the ball moving better, created clear chances, but we didn't have that little bit of luck that you always need. We don't need a miracle like Barcelona had in their return match against Paris. If Neuer doesn't have a day like that then maybe we could score more goals.
Ronaldo's finishes against Bayern keep the Spanish side challenging on both a European and domestic front with Real also in prime position to claim La Liga this season.
Ronaldo scored twice in the second half to help Real Madrid come from a goal down and grab the advantage going into the second leg at the Bernabeu.
Zinedine Zidane is counting on Real Madrid to produce a second masterclass away from home this week as they turn their focus back onto domestic matters.
"For the second leg he will 100 per cent be back".
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But the reality of this Real Madrid team is that they've always been about seizing the moment more than dominating games.
Ronaldo, the four-time world player of the year, volleyed Real level at the Allianz Arena early in the second half, then reached his milestone by slotting home the victor 13 minutes from time in the first leg.
Bayern keeper Manuel Neuer denied Ronaldo and Gareth Bale with fine stops and the tie firmly swung in Real's favor in the 61st minute when Javi Martinez was sent off following two quick-fire yellow cards.
Ronaldo is also the leading goal scorer in the Champions League.
It had been a frustrating first half for the Portugal forward and his team-mates, Bayern controlling possession and ceding few opportunities for Madrid to attack.
Ronaldo reached the milestone in a historically tough away fixture for Real Madrid, where they had won just once in 11 previous visits.