Indian golfer Anirban Lahiri completed six more holes, striking birdies on the last two, before play was called off in the weather-hit Zurich Classic, which has been reduced to a 54-hole tournament.
Lahiri was five-under for 46 holes and is currently T-42 -- a jump of eight places T-50 after two rounds.
He was three-under at the end of two rounds and needs a high finish to get into the top-50 and earn a berth into the Players Championships in two weeks' time. Lahiri has seen action in spurts -- he played six holes on the first day, 30 on the second, two on Saturday and another six on Sunday. He has eight more holes left.
Jhonattan Vegas birdied two of five holes he was able to play in the rain-delayed third round giving him a share of the lead with Brian Stuard.
Tournament officials said the event would be shortened to 54 holes and was slated to resume Monday morning.
Vegas made birdie putts from beyond 7 feet on the first two holes to reach 13 under, then parred three straight before steady rain, accompanied by intermittent thunder, forced organisers to clear the water-logged TPC Louisiana after little more than two hours of play.
Stuard, who has not made a bogey in the tournament, had one birdie Sunday. Like Vegas, he'll resume play on the sixth hole.
Top-ranked Jason Day was in a five-way tie for fifth at 10 under through 44 holes.
Rain, which also delayed play Thursday and Saturday, is again forecast for Monday.
The Zurich Classic became the first PGA TOUR event to be shortened to 54 holes since the 2013 Hyundai Tournament of Champions at Kapalua. The last Monday finish was the Farmers Insurance Open at Torrey Pines in early February.