By definition, the event is open to amateurs, but has been dominated by professionals; through 2022, all editions have been won by pros.

Bernhard Langer became the oldest U.S. Senior Open Champion in 2023, winning at the age of 65 years 10 months.

[3] The total purse was the highest of any senior tour event until the Posco E&C Songdo Championship in South Korea, a Champions Tour event in 2010 and 2011 with a $3 million purse, but had a lower winner's share ($450,000).

Like other senior majors, players must walk the course unless they receive a medical exemption to use a cart.

[6] Special exemptions are given occasionally, and like other USGA events, many qualify through the local and sectional ranks.