Real Madrid took control of their Champions League semi-final against Bayern Munich with victory in the first leg at the Allianz Arena.

The holders, attempting to win the competition for the third successive season, struggled defensively but were clinical in attack - and Marcelo and Marco Asensio scored either side of half-time.

Marcelo smashed home a half-volley from the edge of the penalty area to level matters before Asensio capitalised on an error by Rafinha to score a breakaway goal.

Joshua Kimmich had put Bayern in front when he slotted past Keylor Navas at the near post.

The German champions missed a host of chances in an error-strewn encounter, while Real forward Cristiano Ronaldo had a goal ruled out for handball as his run of scoring in every game of this year's competition ended.

Bayern must now score at least twice at the Bernabeu next Tuesday to prevent Real reaching a fourth final in five years.

Real have become specialists at progressing through the European knockout rounds in recent seasons, and this win was a perfect example of their ability to grind out results.

The defensive issues which led to a 3-1 defeat in their dramatic quarter-final second leg against Juventus resurfaced in the first half here, and they could have been further behind before Marcelo scored against the run of play.

Manager Zinedine Zidane made a change at half-time - replacing forward Isco with Asensio - but the game initially continued in the same vein.

However, when Rafinha gave the ball away near the halfway line, Lucas Vazquez and Asensio pounced at pace before the latter calmly lifted the ball home.

Ronaldo was a peripheral figure and did not have a shot on target in the match, the first time he has failed to do so in the Champions League since May 2017.

He did have two efforts - sending a header wide and sending a shot from distance so wildly off target it went out for a throw-in.

Despite that, Real look well placed to reach yet another final.

They may not look as dominant as in the past two seasons, but they remain on course to become the first team since Bayern in 1976 to win a third successive European Cup.

"Real weren't spectacularly special," former Chelsea winger Pat Nevin said on BBC Radio 5 live. "They have ridden their luck but Real Madrid somehow found a way to win and you don't know how they do it."