AFP - Sweden's two-time US PGA Tour winner Daniel Chopra grabbed the clubhouse lead at the Singapore Open on Friday as Padraig Harrington finally found form to stay in the rain-hit tournament.

Once again lightning disrupted the day with more than half the field failing to finish, including first round leader Ian Poulter and world number two Phil Mickelson.

The US-based Chopra is safely home on seven-under-par 135 after firing a sizzling bogey-free 65 with Australia's Andrew Dodt and China's Liang Wenchong two shots further back.

But England's Poulter is charging and is also seven under after three holes having picked up two birdies.

Taiwan's Chan Yih-Shin is on the same score after seven while South Africa's Ernie Els is a shot further back after three.

Ireland's three-time Major winner Harrington played a gruelling 27 holes, recovering from an appalling start to finish strongly on the final nine to stay in the hunt, eight off the pace.

Mickelson is also eight behind the leaders after four holes of his second round, shooting pars after dropping a shot on the first.

Chopra said he felt he had not achieved what he should have this year but his game was starting to come together.

"Of all the years that I have been playing in the United States I've under-achieved most this year," he said.

"But I think I have been playing well and I've always believed that good things were just around the corner."

He had a bogey-free round Friday and said he was feeling comfortable.

"I started a little edgy but relaxed and just got used to the greens."

Liang looked on course for a share of the lead but had to take a drop shot on the 16th and ended with a bogey to be two off the lead.

The former Asian number one though was happy to be in contention.

"I'm teeing off very well but I need to improve the putting," he said.

"It's a big event and playing the world's top players seems to bring out the best in me and gives me motivation to play better.

"I believe I have the right frame of mind to cope with being one of the top Asians in the field this week."

World number six Harrington had to finish his first round then head straight back out and the weather delays clearly affected his concentration.

The Irishman hit three bogeys and a double bogey in his opening round before recovering in the second with four birdies on the back nine keeping him in the tournament.

His 69 left him with plenty to do but he thinks he still has a chance.

"The first holes I wasn't comfortable with my game and didn't get any breaks and it was all going away from me," he said.

"But I played nicely coming in. Certainly I could get amongst the leaders.

"It would probably take two 65s or so but it's do-able. I certainly played a lot better coming home and if I play like that I can shoot two low numbers."

Meanwhile, Chapchai Nirat rocketed up the leaderboard when the burly Thai star sunk a hole-in-one at the eighth. It was the 29th hole-in-one on the European Tour this year and the ninth in Asia.

Chapchai is four-under-par for the tournament having completed his second round.