In BO1 and BO3, how is first turn and battlefield selection determined?

Ruling: In BO1, battlefields are randomly selected. In BO3, battlefields are chosen by both players (each battlefield can only be used once per match). For the first game in both formats, first turn is chosen by the winner of any agreed upon random method (like rolling dice). In BO3, after the first game, the loser of the previous game decides who goes first.

Sequence:

• Game 1: Random method determines who chooses first turn
• Game 2 and beyond (BO3 only): Loser of previous game decides who goes first

Nuances:

• In BO3, once a battlefield is used, it cannot be used again in the same match
• Most players use "high roll" (rolling dice) as the random method
• The random selection for first turn only applies to the first game