I played an indoor club league match with a guy. First 2 sets was 1:1. Since the court time was almost up. I asked him if he wanted to play a 3rd set or to play a 10 point match tiebreaker. He said he wanted to play a 10 point match tiebreaker. During the tiebreaker, he was leading 9-7 with 2 match points, but I finally came back and won the tiebreaker 11-9. After we shaked hands, he somehow pulled out a flyer of rules that is attached to our league schedule. He pointed out that according the rules, we should've played the 7 point tiebreaker. He argued that since he was leading 9-7, he should be the winner. Of course, I disagreed with him. After argueing back and forth, I finally offered him a rematch of the 7 point tiebreaker, he agreed. So we played another tiebreaker, and I won 8-6. We shaked hands again and it seems that he conceded his loss. However, to my amazement, he went quickly to the front desk and reported that he won the match. This is the most funny experience I had. What do you guys think?