Hi there, what sport or activity and at what level(recreational, HS, college, professional) are you asking about.My name is XXXXX XXXXX I am glad to help
I will await your reply in case it differs from my answer but in the mean time I will treat this question as if you were asking about Tennis and use the US Tennis Association rules as our reference for this.If you started serving first in the last set, then your opponent begins the serve for the next set. In other words if your opponent served the last game before the tiebreaker, then he will also start serving in the next set following.Please let me know by accepting the answer if you were in fact referring to tennis. My name is XXXXX XXXXX I am standing by to assist you further if needed.
I ACCEPT YOUR ANSWER. Thank you for your prompt response.