Coman Tiebreaker
The Coman tiebreak procedure, according to the USTA, is the same 12-point tiebreaker, except that the players change ends after the first point, then after every 4 points (after the 5th, 9th, 13th, 17th points, and so on), and at the end of the tiebreaker (before the next set begins). The scoring is the same as a traditional tiebreaker, and the procedure is the same as a set or match tiebreaker. If the set score is 6-6, the player whose turn it is to serve serves the first point from the deuce court. After the first point, the players change ends and the following 2 points are served by the opponent in singles or opponents in doubles—that is, the player of the opposing team due to serve next—starting on the left side. Then each player or team serves alternately for 2 consecutive points (starting with the left side, or ad court). The opponents change ends after every 4 points until the end of the tiebreaker.
The Coman tiebreaker has two advantages:
The more frequent changing of ends results in elements such as the sun and wind being distributed more fairly between the two opponents. In the traditional 12-point tiebreaker, a player or team plays 6 consecutive points from the same end before changing sides.
In doubles, the server will always serve from the same end of the court that he did throughout the set, rather than having to serve from both ends.
Tennis: Steps to Success Jim Brown,Camille Soulier