World number two Jordan Spieth shrugged off two weather delays to charge up the leaderboard in the third round of the WGC-HSBC Champions in Shanghai on Saturday.
The start of play at Sheshan International was delayed by 30 minutes due to the threat of lightning and only 40 minutes of action was possible before the players were called off the course.
However, the suspension proved short-lived and Spieth was soon making inroads into his 10-shot deficit to fellow American Kevin Kisner with birdies on the third and fourth.
Spieth, who can overtake the absent Jason Day at the top of the rankings with a top-13 finish this week, also picked up shots on the seventh and eighth to reach the turn in 32 and started the back nine with another birdie on the 10th.
That took the Masters and US Open champion to nine under par and six shots behind Kisner, who had birdied the second to lead by one from playing partner Russell Knox, the Florida-based Scot having picked up shots on the first two holes.
China's Li Haotong was two shots further back after starting his round with a hat-trick of birdies, with first-round leader Branden Grace and American Patrick Reed a shot behind on 11 under.
World number three Rory McIlroy, who was suffering from food poisoning earlier in the week, had recovered from a bogey on the second with four birdies in the next eight holes to improve to seven under par.
Spieth surprisingly left a birdie putt from 12 feet on the 11th inches short, but made no such mistake from twice the distance on the next to edge a shot closer to the lead.
Knox had moved top of the leaderboard after almost spinning his approach to the third back into the hole and tapping in for a third birdie in a row, while Kisner had three-putted from short of the green.
That was the first bogey of the week for Kisner after flawless opening rounds of 64 and 66, but the 31-year-old r esponded immediately by holing from 25 feet on the fourth to rejoin Knox on 15 under.
Li had holed from 20 feet on the fourth to make it four birdies in a row, but pulled his tee shot on the next into the trees to drop a shot and fall back to 12 under alongside 2013 winner Dustin Johnson, who had birdied four of the first seven holes.