In the first game, the higher seed is the home team. If both teams were seeded equally, they flip a coin (National seeds > Other #1 seeds).
After that, home team is determined in this order...
1. The team that has been the home team fewer times.
2. The team that has been the visitor more times.
3. If the two teams have already met in the tournament, the visiting team from before will be the home team.
4. If they haven't met, whoever was visitor in their most recent game will be home team.
5. Coin toss.