It's been a devastating shot this clay court season, particularly in Madrid, and it's won Federer a nice amount of points straight out, or set him up to put the ball away easy. Even on hard courts, who remembers when Federer hit a drop shot on Murray and just walked off, knowing he would win the point. Murray scrambled but still couldn't get to it. On grass courts, it dismantled Marc Giguel in Wimbledon 2008. Federer should use this more. A commentator mentioned how a few years ago Federer said "dropshots weren't him". Well make it a part of you Federer!