I answered the challenge as it was written. It did not specify first serve, nor speed. I'll stand by my answer.
Like Hoophound said, you see enough serves from players better than you, you pick up things that increase your odds of being able to get to the ball and make contact. It is reactive and you need a quick first step to have any chance, which is why you see guys bouncing on balls of their feet. It's not all that dissimilar from baseball in reading a pitcher. Ball is coming in faster, but from a greater distance. You're probably 85-90 feet away from where ball is delivered, and you have a much bigger hitting surface than a bat provides. But you're not standing in a batters box, you have to move.
I'm not saying it's easy by any means, but if someone is athletic and quick, I think the odds of that guy making contact is more than zero over the course of a 3 set game (minimum 72 first serves and 3-4 second serves if my math is correct).
I'll stand by that. Your experience is yours, mine is mine.