How do head-to-head tie breakers work?
The winning percentage of each tied team is calculated for all the games played against the other tied teams. This winning percentage against all tied teams is used as the standings tie breaker.
A team that has not played the other tied teams (having a record of 0-0) has, by default, a .500 record. So, if 3 teams are tied and their records against each other are, respectively, 2-1, 0-0, and 1-2, the 2-1 (.667) team is first in the standings, the 0-0 (.500) team is second and the 1-2 (.333) team is third.