SHANGHAI - World No. 2 Jordan Spieth fired the round of the day, a flawless nine-under 63, to climb into contention at the World Golf Championships-HSBC Champions on Saturday in Shanghai.
The 22-year-old American had nine birdies and no bogeys to storm up the leaderboard from 27th to a share of fifth place, three shots behind leader Kevin Kisner.
Weather delays due to rain and thunder in the morning meant two players of the last three-ball group finished in almost total darkness after the 5.02pm sunset time at the Sheshan International Golf Club.
The third member of the group, Scotland's Russell Knox, exercised his right not to tee off on 18 in the gloom and will have to come back on Sunday morning to complete his third round.
Overnight leader Kevin Kisner saw his lead whittled to one stroke after a 70 took him to 16-under par.
One shot behind are Knox, the 2013 winner here Dustin Johnson and China's young Li Haotong, who for the third day running showed he could compete with the cream of world golf by shooting a 66.