U.S. Open play is characterized by tight scoring at or around par by the leaders, with the winner usually emerging at around even par. A U.S. Open course is seldom beaten severely, and there have been many over-par wins (in part because par is usually set at 70, except for the very longest courses). Normally, an Open course is quite long and will have a high cut of primary rough (termed ''Open rough'' by the American press and fans); undulating greens (such as at Pinehurst No. 2 in 2005, which was described by Johnny Miller of NBC as ''like trying to hit a ball on top of a VW Beetle''); pinched fairways (especially on what are expected to be less difficult holes); and two or three holes that are short par fives under regular play would be used as long par fours during the tournament (often to meet that frequently used par of 70, forcing players to have accurate long drives). Some courses that are attempting to get into the rotation for the U.S. Open will undergo renovations to develop these features. Rees Jones is the most notable of the ''Open Doctors'' who take on these projects; his father Robert Trent Jones had filled that role earlier. As with any professional golf tournament, the available space surrounding the course (for spectators, among other considerations) and local infrastructure also factor into deciding which courses will host the event.

has the us open ever been won over par?
yes