Can both players reveal the same battlefield when starting game 3 in a best of 3 match?

Ruling: Yes, both players can reveal and use the same battlefield in a given game in 1v1 play. There is no rule preventing this.

Nuances:

• In 2v2 multiplayer, teammates cannot use the same battlefield
• The restriction on selecting different battlefields each match refers to a single player not selecting the same battlefield twice across games, not a restriction against opponents using the same battlefield