Ryder Cup hero Martin Kaymer carried on where he left off in the first round when the 114th US Open resumed at Pinehurst on Friday.

Kaymer's opening 65 was the lowest score ever in the US Open at Pinehurst, eclipsing the 66 recorded by Sweden's Peter Hedblom in 2005 and giving him a three-shot lead over the chasing pack.

The 29-year-old German fired one bogey and six birdies and picked up another birdie on his opening hole today, holing from six feet on the par-five 10th.

That briefly extended his lead to four shots, only for Zimbabwe's Brendon de Jonge to recover from a bogey on the first with birdies on the third and fourth as Pinehurst continued to play far easier than expected.

Asked on Wednesday what score he would be happy with after four rounds, former world number one Kaymer had said eight over par. But with tournament officials electing to water the greens on Wednesday evening and more than half an inch of rain falling on Thursday night, scoring conditions were again perfect for the early starters.

A total of 35 players had shot par or better on the opening day, including Sweden's Henrik Stenson, who finished one under and can overtake Adam Scott as world number one with a victory on Sunday.

England's Paul Casey returned a 70 on Thursday and remained level par after following a birdie on the first with a bogey on the second.