Originally Posted by ProdigyEng
Berdych forehand. Caused the top 4 trouble on a few occasions (Mainly Fed and Murray), but unless it's the perfect conditions for him, they can all cancel it out.
He didn't beat those players/caused them trouble due to his forehand, but rather his ability to generate power effortless with short compact swings and force them to be constantly on the defensive. Also his ability to return Federer's serve.