This is an excerpt from Colorado USTA's November 28, 2018 League Alert.

Coman tiebreak procedure changes to standard tiebreak

The Coman tiebreak procedure will no longer be used for any league matches in Colorado. Instead, all set tiebreaks and match tiebreaks in local leagues and district championship matches will be played using the standard tiebreak (play 6 points on a side and then switch sides).