Yes, you can have a let second serve in tennis. In the rules of the game, a player is allowed to hit as many let serves as they wish during their service turn. This means that if your first serve fails to go over the net or lands outside of the court lines – either long or wide – then you are entitled to take another shot at serving without penalty. It's important to remember though that this only applies on your first two serves and not any subsequent ones; meaning that after two lets, the ball must be put into play with an acceptable serve otherwise it will count as a fault against you. The advantage of having two attempts at getting your serve right provides players with more opportunities for making sure their shots succeed but also adds extra pressure when serving under pressure situations such as tie-breaks and match points where multiple serves could make all the difference in winning or losing.