Bubba Watson topped the leaderboard at the Shenzhen International after an opening round curtailed first by the threat of lightning before darkness saw play suspended for the day.
The big-hitting Watson has been one of the headline acts in each of the first three editions of the event and arrived at Genzon Golf Club looking to improve on his best finish of a tie for eighth last season.
Watson, who has slipped to world number 22 after ending 2016 in 10th, came into the European Tour event on the back of a disappointing missed cut at the Masters - a major he won in 2012 and 2014. "The more you play the golf course, the more you are going to learn it and get better at it", he said.
"I was in a similar position a couple of weeks ago in Malaysia and had a sloppier day, so I'm happy with the way I bounced back and to shoot three under par is a decent score today". "Like the saying is, this is our home course, so after two years of playing it I should know by now".
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The two-time Masters victor then backed up another gain on the first with a superb second shot into the par five, second green that set up an eight-foot eagle putt which he drained to take the lead. Duncan Stewart also got finished, signing for a 71, but Richie Ramsay and Scott Jamieson faced an early-morning return to complete their opening circuits.
Duncan Stewart and England's James Morrison lie two strokes further back, the Scot having picked up three strokes in the eight holes he managed to complete.
Wiesberger had a four-shot lead coming into the third round but quickly saw that wiped out by Grégory Bourdy, who joined Mikko Korhonen in making a hole-in-one on Saturday.
Pamela Pretswell (68) and Kelsey Macdonald (69) also opened brightly, with Sally Watson breaking par as well with her 70.