Joaquin Niemann accepted that he broke a new rule at the US Open but claims the penalty imposed upon him was harsh. Shinnecock Hills has a well-established reputation for testing the patience of the world's finest golfers during its previous US Open stints as host. For virtually the entire field - with the exception of Wyndham Clark - that proved to be the case at some stage across the opening two rounds. Niemann was no different on Long Island's East End.