Yesterday i tried a new serve playing volleyball which puts a ton of topspin on the ball. i pushed upwords....?

more then out, trying to put the spin on the ball and now my my elbow hurts whenever i fully extend. straighten your right arm straight out. then put your left hand on the right side of your elbow. i feel the pain around there, and maybe a little bit higher then the spot you may have touched hah. anyone know what i did?