The U.S. Open is one of the five major tournaments in the Professional Bowlers Association. Despite its status as a PBA Tour major, the tournament is open to qualifying amateurs as well as PBA members. The U.S. Open is considered one of the most difficult tournaments to bowl in today, due to its long format (56 games from opening qualifying through the match play rounds; 64 games if a player from the pre-tournament qualifier makes it through) and demanding oil pattern, which differs from most oil patterns the PBA employs.[1]