Eagle at the first sets Nicolas Colsaerts up for a 66 to lead at China Open

Overnight leader Jamie Donaldson, of Wales, failed to capitalise on his sparkling 61 yesterday as he slipped to fifth with a 70, but 22 players are within six shots of the lead.

Colsaerts, of Belgium, showed his power in Chengdu as he played the four par 5s in five-under-par courtesy of an eagle at the first and three birdies.

"An eagle on the first was the best start I could have hoped for," said the world No.175.

"I'm not sure if I'm the only one but I hit a driver over the river and tried to give myself the shortest line in.

"I holed from 25 feet and it was the best start.

"On 18 I probably hit the best drive of the day - it was a bit down and went off to the left.

"The wind changed the course dramatically today. You had to think more about certain tee shots.

"The other days you could pretty much go at every pin and the ball would stop where it landed.

"With these greens you always want to be on the right side but it was harder with it being dry."

Chang-won Han led after day one when he opened with a 64 but a second-round 70 had dropped him out of the top ten.

The former Asian amateur champion was in top form once again though as he birdied five of his first seven holes en route to a best-of-the-day 65.

The 19-year-old, playing only his second event as a professional, was delighted.

"I played perfectly today - some good shots and good putts," he said.

"I took confidence from my putting today. When I missed shots I made the putts, that helped my round." Ireland's Peter Lawrie and France's Gregory Havret are tied for third after both carded 68s to advance to 16 under.

Meanwhile, Lee Westwood's fine six-under-par 66 saw the world number two open up a five-stroke lead going into the final round of the Indonesian Masters.

Westwood collected eight birdies and two bogeys including one at the last at Royale Jakarta Club to finish 16 under par, well clear of Thailand's Thitiphun Chuayprakong and Korean Park Hyun-bin.

Having come back in the morning to finish the final two holes of his second round, a change of putter then paid dividends for the Englishman.

"It feels much better using the conventional putter because every decent putt seems to go in and that made me more comfortable," said Westwood.

"I've been in this position before and I'll try not to get ahead of myself. I'm here to win a tournament. World rankings seem to take care of themselves."

Thitiphun shot a three-under 69 and Park a two-under 70 to finish 11-under, while Thai Prayad Marksaeng is one shot further back on 10-under following a 69.