Question: Which serves work best against tall players?
Answer: Use any one of the curving spins to serve into the body of a tall player, which will make his long reach a disadvantage. When you "jam" him, he has farther to move than a shorter player would to get to the distance from the ball where he'd normally want to swing. Serving straight into the body can work, but a ball that curves into him is more likely to catch him by surprise.
A very low, skidding slice serve can bother some tall players who don't reach down well.
