Matches are played best two out of three sets, regular ad scoring, with a 10-point tie breaker in lieu of a full third set, if necessary. Players can agree beforehand to a full third set, or other score-keeping, if necessary for time, weather, or other reasons.
Scoring examples -
Smith d. Jones, 6-4, 3-6, 10-4
Jones d. Smith, 7-6 (4), 5-7, 13-11