Bayerns heynckes fears ronaldo in heavyweight semi final clash

I think there may be some confusion here!

Bayern Munich is a German football club, and Jupp Heynckes is a former manager of the club. Cristiano Ronaldo is a Portuguese professional footballer who has played for several clubs, including Manchester United, Real Madrid, and Juventus.

It's unlikely that Bayern Munich and Jupp Heynckes would be involved in a "heavyweight semi-final clash" with Cristiano Ronaldo, as this would imply a boxing match or a high-stakes competition between the two individuals.

If you meant to ask about a hypothetical football match between Bayern Munich and a team featuring Cristiano Ronaldo, I'd be happy to help with that!