Format
The tournament format is essentially double-elimination (a player is out of the tournament after losing two matches) until two players remain. Most professional pool "double-elimination" events, however, are not true double-elimination formats, where the player who reaches the finals from the loser's side has to defeat the winner's side player twice for the title. At the U.S. Open, matches are played in races to 11, with the winner breaking. However, the final match, as is customary with most professional nine-ball tournaments today, is one extended race. At the U.S. Open, the extended race in the finals is 13 games.
Read more about this topic: U.S. Open Nine-ball Championship