First-round play was suspended for two hours when a tropical storm hit Royal Selangor Golf Club in Kuala Lumpur. The 36 players left on the course are scheduled to complete their first 18 holes prior to the start of round two.
Argentina's Ricardo Gonzalez shot 65 to join Harmeet Kahlon of India in third place at 6-under. Another Indian, Jyoti Randhawa, led a quartet of golfers with 66s, while three more players were at 5-under with holes yet to play.
Forsyth, the 1999 European Tour Q-School medalist, missed out on keeping his tour card by one spot after finishing 116th on the final 2001 money list. He began his quest for earning exempt status by the winning route on an oppressively hot and humid day in the Malaysian capital.
'I don't know how I managed to play well but I played great from the word go,' said Forsyth, who's playing this week on a sponsors invitation. 'But the last few holes were a real struggle. On the 16th I didn't know where I was as my head was spinning and legs felt like jelly.
'I've travelled everywhere and experienced a lot but nothing compares to this. I need to find something to rehydrate.'
The 26-year-old Scot played flawlessly despite the conditions, posting birdies on four of the first six holes. He spread the wealth on the inward nine with birdies on the 10th, 12th, 15th and 17th.
'That is definitely one of the best rounds I have ever played.' he said. 'It was very consistent. Hit it down the fairway and kept hitting a lot of good iron shots and then knocked in a few putts.'
Forsyth's career-best round was a 62 that gave him the second-round lead at the Brazil Rio de Janeiro 500 Years Open in his first year on tour in 2000. He wound up tying for sixth place in that event, one of five top-10 finishes in a successful rookie campaign.
He went on to tally just one top-10 in 2001 - a tie for fourth in the Portuguese Open.
Lane's 63 included a 10-foot eagle putt at the par-5 third and three birdie putts from 25 feet or more over his closing stretch of holes.
'Since last June I started to play better and thoroughly enjoyed the end of the year,' said Lane, whose top-10 showings at last year's Irish, Scottish and Dutch Opens propelled him to No. 41 on the money list. 'I am just really enjoying playing golf. I still feel I can win.'
He hasn't grabbed a trophy since the 1995 World Championship of Golf in Scottsdale, Ariz., a victory worth a hefty $1 million. The last of his four wins in Europe came at the 1994 Turespaa Open de Baleares.
Taiwan's Yeh Wei-Tze, the Malaysian Open champ in 2000, turned in a three-under 68 for a share of 18th place with last month's ANZ Championship winner Richard S. Johnson, and major winners Nick Faldo and Ian Woosnam.
India's Arjun Atwal, who became the first Indian golfer to win on the European Tour with his triumph a week ago at the Singapore Masters, suffered three bogeys and a double-bogey Thursday on his way to a 3-over 74.
This event is co-sanctioned by the European and Davidoff (Asian PGA) Tours.
Full-field scores from the Malaysian Open