Jordan Spieth was just one shot behind the leader after one round, but he fell five shots off the lead at the Singapore Open on Friday before a storm caused the second round to be halted before everyone finished play.
Spieth only completed six holes Friday, recording one birdie and one bogey.
Song Young-han was one of the few golfers who completed the round, firing an 8-under-par 63 to take the lead at 9-under for the tournament.
Song is two shots ahead of two players tied for second at 7-under -- Shintaro Kobayashi, who fired a 2-under 69 on Friday, and Byeong-hun An, who is 3-under after seven holes in the second round at Sentosa Country Club.
Spieth failed to make up any ground on the new front-runner, remaining at 4-under.
"Didn't get off to a great start but made a good birdie on No. 2," Spieth said. "Had a couple of bad putts. Missed a short one on No. 4. On 7, I got a bit unlucky. I had a perfect distance to the hole, the par-5, and just when I hit my second, the wind changed. My ball came up just short of the green, and when I went to play my putt, that's when the rain came in hard, almost horizontally. My putt came up 7 feet short."
Keith Horne and Hideto Tanihara were tied for fourth at 4-under par, but Horne only completed two holes in the second round and Tanihara got through seven.