The American double major winner sped through the closing holes of his third round at the weather-hit event on Saturday in a bid to avoid an early Sunday resumption, but his rapid play proved in vein as fading light halted proceedings on the 17th.
He returned to the Sentosa Golf Club at 7:30 a.m. (2330 GMT) on Sunday and his first shot was a missed par putt but he then managed to birdie the last to sign for a one-under-par 70 and six-under total, five adrift of leader Song Young-han (69).
"Very frustrating Friday and Saturday rounds just not making right decisions," the 22-year-old Texan told reporters.
"I am just rushing myself, trying to do too much and trying to think this golf course is going to yield an eight-under like its nothing but it does not.
"So we are going to play the last round differently and take a lot of confidence off the finish today," he added.
"I have got to hit as many greens in regulation as possible, I just have not done that. When I say greens in regulation I am going to hit it on the correct tiers as much as possible. 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."
COLD PUTTER
Spieth started the Asian Tour and Japan Golf Tour season opening event with a four-under 67 but struggled to match that effort over the next two rounds with a cold putter largely at fault.
The Texan said he only had himself to blame for the number of efforts missed on a testing Saturday, when he played 28 holes after storms brought an early close to play on the opening two days.
"The greens are fantastic. I actually think they are very easy to putt, (but) tough where the pins are on different grain changes.
"So it will mess you up a little bit if you are trying to read too much into them, otherwise they just putt very straight.
"I over-read a lot of putts at the start (of the tournament) and I am going to try and be a little bit more aggressive with my putter as I try to dial other stuff back to make sure I am in position."
Song, looking for a first tour title, also returned early on Sunday to finish his third round. The South Korean picked up three birdies against one bogey to shoot a 69 and sit two clear of Japan's Shintaro Kobayashi (69) on 11-under.
(Editing by John O'Brien)
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