American Johnson Wagner chipped in for birdie and took a one-shot lead in the US PGA Tour's Safeway Open by keeping bogeys off his card in the rain in Napa, California.
Wagner was at 15-under par through 15 holes when the third round was halted as rain caused puddles to form around the edges of the green.
Fellow American Scott Piercy was just short of the 16th green when he told tour officials he couldn't play his shot because of the water.
Piercy was in the last group with Wagner and at 14 under while campatriot Pattron Kizzire joined him in a tie for second through 16 holes.
England's Paul Casey was two shots off the lead and in the final group. Casey hit a tee shot on the par-5 fifth hole that clipped a tree, ricocheted somewhere and was never found, costing him two shots.
Phil Mickelson hit a wild tee shot on the par-5 18th and made bogey for a 69, leaving him six back.
Cameron Smith finished a two-under-par third round to be the best-placed Australian in a tie for 29th at six under.
