How do you hit a slider?

Tennis works in a spin to speed ratio. As the spin on the ball increases the speed will decrease. This is because more power is put into spinning the ball and not hitting through it.

The trick with a good slice serve is to maintain the speed while keeping the spin to allow it to curve out of their comfort zone. This is obviously easier said than done. The only way to increase one is to sacrifice the other and the only way to increase both is to have a more powerful serve. Try incorporating more power sources into your serve.

The easiest way to create a serve that will not be returned is placement. A 140 mph serve hit by roddick down the middle of the court was returned by federer without a wince. A 70 mph slice by nadal during wimbledon forced federer to return the ball with a defensive slice. What was the difference? It was placement.

A 50mph serve placed right could probably force a bad return or no return off a 4.0 player with good placement. Take advantage of the spin on your serve and place it as far into the serve square as possible in the direction of the kick on the serve.

Hopes this helps =D

you have to sacrifice spin for speed. the pros swing just as hard for first and second serves. the only difference is that their second serves are pretty much all sping. this is how to do a slider. if you want to usee a lot of spin, then try to land it shorter in the box and closer to the line. the spin will make it die, and your opponent will not be able to return it affectively if they can get to it. another option is to go half and half. swing as hard as you can as usual, but try to hit it flat with a little bit of spin. this makes it more consistent, but has more pace

It is normal that spin makes speed go slower.