Mixing up your serve during a match can mean the difference between holding off your opponent or losing your service game.
While there are dozens of variations you can use to mix up your serve, the aim is the same: Keep your opponent guessing to make it harder to return the ball.
When most players think about mixing up their serves they think of using placement and spins. You can go beyond these two options and also add speed and stance location to the mix. Here's how and when to use these four options.