Jordan Spieth's woes with the putter continued to stall his momentum at the Singapore Open on Sunday as he fell five shots off the lead heading into the final round.

Returning to the Sentosa Golf Club shortly after sunrise to finish his third round due to rain delays on previous days, the world's top ranked player missed his par putt on the 17th green, where he had marked his ball overnight, to drop back to 5-under for the tournament.

The American immediately regained the shot when he birdied the par-5 18th, one of the easiest holes on the course, but lost more ground to the leader, Song Young-han of South Korea.

Ranked 204th in the world, Song birdied three of his remaining five holes to lead the tournament at 11-under heading into the final round, which was already underway before the leaders had finished their third rounds as organizers sent the backmarkers out early in case it rained later in the day.

Japan's Shintaro Kobayashi, playing in the final group with Song, also made a bright start, birdieing two of his last three holes to be outright second at 9-under, one shot clear of China's Liang Wen-chong, who had the benefit of a sleep-in after finishing his third round on Saturday evening.

Japan's Hideto Tanihara was alone in fourth at 7-under with Spieth just behind him in a five-way tie for fifth and vowing to go for broke to try and shoot a low score to win the Asian Tour event.

"I have got to hit as many greens in regulation as possible, I just have not done that," said Spieth, who intended to be more aggressive on the greens Sunday.

"I have been out of too many holes this week to get anything going. All it takes is a little bit of a spark, a little confidence with my ball striking to make sure I have got that distance control down and the putting will come."

.