Thunderstorms halted play for over an hour in the first round of the US Open at Oakmont outside Pittsburgh on Thursday.
The players were called off the course just after 10:04am after three hours and 19 minutes of play as the bad weather system moved through.
They resumed play 79 minutes later after 0.5 inches of rain fell on the layout, but more storms were forecast to move through the area later in the afternoon.
The lead was being held by American world number 624 Andrew Landry at three-under par after 11 holes.
Four players — Kevin Streelman, Matthew Fitzpatrick, Danny Lee and Lee Westwood — were grouped on two-under in the middle of their rounds.
Rory McIlroy got his campaign off to a dismal start, finding fairway bunkers off the tee at the second and third to drop two shots. He battled back with a birdie at the fourth.
Playing partner and Masters Champion Danny Willett birdied the second but promptly handed that back at the next hole and he dropped another one at the fourth.
Defending champion Jordan Spieth was steady, starting from the 10th with two pars and then making birdie at the 12th.
World number one Jason Day and six-time runner-up Phil Mickelson both had afternoon tee-times.