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This week's US Open course will be "tough but fair" insist tournament organisers in the wake of concerns from players that the greens are already "borderline" out of control.

The 124th staging of golf's second-oldest major is at the notoriously tough Number Two course at Pinehurst.

Only four players have finished under par in three previous US Opens held at the North Carolina track.

Defending champion Wyndham Clark said on Monday the pace of the undulating greens was "borderline" in terms of being too quick, while on Tuesday three-time winner Tiger Woods said he and other players had "putted balls off the green" and he was expecting a "war of attrition" this week.

In defence, John Bodenhamer of the United States Golf Association (USGA), said: "We're going to be the USGA. It's going to be the US Open.

"We're going to be tough but fair. The players know that. I think they want that. I think that they want to win something special.

"We're tough but fair because when you win, it means what Bob Jones won, what Ben Hogan won, what Tiger won. It just means more.

"It's not about the score. It's about getting every club in a player's bag dirty, including the one between their ears.

"We are not looking to be everybody's best friend, but we are looking to earn their respect."

Germany's Martin Kaymer won with a score of nine under, eight clear of the field, the last time the US Open was held at Pinehurst in 2014. Payne Stewart won on one under in 1999, while level par was good enough for Michael Campbell to beat Woods by two shots in 2005.

Follow live text coverage of all four rounds of the US Open on the ����ý Sport website and app from 1230 BST on Thursday, with radio commentary of the final two rounds on Saturday and Sunday on Radio 5 Live, 5 Sports Extra and ����ý Sounds. Click here for full details.