I never realized this rule existed but it makes perfect sense. http://espn.go.com/tennis/story/_/id...ld-tour-finals It says that after one match each in a group the winners play each other and the losers play each other. This way you don't have the possibility the semis being decided before anyone plays a third match (two 2-0s and two 0-2s). So after two matches each it will ALWAYS be 2-0, 1-1, 1-1, 0-2. I never realized that!