Luke Donald remained on top of the leaderboard as the delayed first round of the 113th US Open Championship resumed on a cold, overcast morning at Merion.
Donald birdied the 11th, 12th and 13th before play was suspended for the day due to darkness on Thursday evening after two delays for bad weather totalling more than four and a quarter hours.
That gave the World Number Six a one shot lead over five-time US Open runner-up Phil Mickelson, who had completed an opening three under 67 to set the clubhouse target, with Belgium's Nicolas Colsaerts (69) the only other player to complete a sub-par round.
Play resumed at 7:13am this morning and Donald parred
the difficult 14th and 15th holes to remain four under.
Playing partner Lee Westwood did likewise to remain one under
, the former World Number One saving par on the 15th after finding a fairway bunker off the tee and coming up short with his approach.
Westwood had been sharing the lead yesterday when his third shot to the par four 12th clattered
into one of the wicker baskets used at Merion instead of a standard flag and rebounded back off the front of the green, leading to a double bogey six.