USA with the following modifications:

• Mercy rules: 15, 12, and 10 after 3, 4, and 5 innings.
• Drop dead time at after 80 minutes. If home team is ahead, score is final. If home team did not get final ups, score reverts back to previous completed inning  
• Time limit procedure: once the last out is made in an inning, the new inning starts at that time.
• Double coin flip before each game.
• Continuous batting order in pool play IS a USA rule and is available to any team choosing to use it.