HailDjokovic
Semi-Pro
Go to any 2015 highlight and you'll see tons of drop shots. He maybe misses one out of every 6 or 7. In addition to that he employs it a lot more than everyone else, so it is hard to find a rhythm against him.
The only person I can think of with a drop with that much spin and consistency on a daily basis is federer(past and present)
The only person I can think of with a drop with that much spin and consistency on a daily basis is federer(past and present)