Serving is a fundamental part of many different racket sports, and it's important to know how many lets you can serve in a row. Depending on the particular sport, this number could vary. In tennis, for example, there is no limit to the number of consecutive serves that are allowed - as long as each one meets all of the rules regarding spin, speed and placement. However in squash or badminton there is an upper limit of 5 consecutive serves per player before changing ends with your opponent. This rule exists so that opponents have time to regroup and prepare for the next rally between them. It also ensures fairness during competitive play by preventing any potential player from having too much control over their opponent through repetitive serving ability. Ultimately though it comes down to what you're playing - so make sure you check out whatever regulations are relevant for your specific game!