Bad weather forced the suspension of the Ballantine's Championship with Miguel Angel Jimenez and Brett Rumford leading midway through the third round.
Spaniard Jimenez holed three birdies to join Rumford, from Australia, on 10 under after nine holes in South Korea.
Wales' Rhys Davies birdied three of the first five holes to reach eight under.
World number one Lee Westwood was six under after 12 but an errant tee shot on the par-three 13th left him a tough chip when play resumes on Sunday.
Westwood, who needs to win the tournament to ensure he remains top of the rankings, made a good start to his third round with birdies on the opening two holes, which he followed with 10 pars.
But he faces a tricky situation when he returns to the Blackrock course after pulling his tee shot left of the green on the 13th, moments before the hooters sounded to bring play to a premature close.
Rain deluged the course and the threat of an electrical storm in the Icheon area left marshalls with no alternative except to call play off for the day.
The break halted Jimenez's impressive charge after the 47-year-old continued his excellent scoring on the front nine - he is yet to drop a shot while sinking seven birdies over his three rounds.
"I played very well the first nine holes, hitting it very well," he said. "Tomorrow I play 27 holes. I feel good, I feel fine. Tomorrow is a marathon."
Rumford, who fired a bogey-free nine-under-par 63 on Friday to move to the top of the leaderboard, parred the first six holes before dropping back to nine under with a bogey on the par-three seventh.
However, he birdied the eighth to reach the turn level par.
"There were some tricky pins out there," he admitted.
"They were placed up on the top part of all the tiers and ridges and it was pretty tricky trying to get on the right tier.
"You had to be very, very precise. I stayed patient and hit some nice golf shots, but unfortunately just kept hitting nice golf shots to about 40, 50 feet."
Scotland's Richie Ramsey was also on track for an impressive round, three under through 13 to sit in a group of seven on seven under.