Conversation so far:
who has won back to back us open golf tournament
Seven players have won back to back US Opens.
can you tell me a player who has won the us open twice in a row
Brooks Koepka won the U.S. Open in 2017 and 2018.
who has won 3 us golf opens in a row
Willie Anderson holds the record for most consecutive US Open wins with three.

Question: can you tell me about the championship structure
Self-contained rewrite: can you tell me about the championship structure of the us open