I was on the court today and my buddy and I went to a tie-break for the final set. He proceeded to tell me that the rules for tie-breakers had changed, and that we now changeover after 1, 5, 9, etc. He said the USTA had switched to the Coman Tiebreak. I thought the Coman was simply an alternative to the Conventional tie-break and which to be used was discussed beforehand (He and I always played conventionals.) I see the Code addressing both, but I've yet to find where one is the preferred method over the other. I claim that neither is preferred; it's a matter of choice. Anybody got a section number from the code or at least an opinion as to what is the standard tie-break? Thanks.