Tom Hoge topped the leaderboard as the weather again stopped play in the second round of the Barracuda Championship.
The 30-year-old mixed five birdies with two bogeys at the Montreux Golf and Country Club for an overall score of eight for his second round and a total of 21.
The tournament in Reno uses the Modified Stableford scoring system, which allocates points based on the number of strokes taken at each hole.
Fellow Americans Beau Hossler, John Chin and Collin Morikawa were tied for second on 20 points, one point behind Hoge.
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Hossler recovered from two bogeys to make seven birdies – including three straight through holes 11 to 13 – adding 12 points to his first-round score of eight.
Chin moved up 13 places with a second-round score of 11, while Morikawa made four birdies and a bogey for a score of seven.
Scotland’s Martin Laird was in a five-way tie for ninth on 17 points after cancelling out a bogey on the par-four fourth with an eagle and four birdies.
Several players had yet to start their second round when play was suspended in Nevada, with overnight leader David Lingmerth the best of those whose round was interrupted on 17 points through four holes.
Under the Modified Stableford scoring system, eight points are awarded for an albatross, five for an eagle, two for a birdie, zero for a par, minus one for a bogey and minus three for a double bogey or worse.