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Wilson, still seeking his first European tour title, hit a three-under-par 69 to move into the lead on 12 under after the third round and safely negotiated the start to his fourth round before bad light stopped play just before 5 p.m. (09:00 GMT).
Australia's former U.S. Open champion Geoff Ogilvy made a bogey-birdie start to his final round to remain a stroke ahead of Sergio Garcia and defending champion Phil Mickelson on 11 under.
Swede Henrik Stenson chipped in from a bunker to join Wilson at the top of the leaderboard after his 19th hole of the day, but four-putted the third after the hooter signaled the end of play to drop to fifth on nine under.
After losing all of Friday and three hours of Saturday to wet weather, the players were to return to finish the tournament at 7.30 a.m. on Monday morning.
"I'm very pleased with the position, being in the lead is the place to be," Wilson, who made his Ryder Cup debut and was second four times on the European Tour in 2008, said. "I'm getting closer and at least I'm leading after Sunday afternoon. I just have to get a tournament that finishes on Sunday as well."
Impressive roll of honor
Ogilvy was in a good position to add to four career titles, a short but impressive role of honor, which includes the 2006 U.S. Open and WGC Match Play as well as this year's CA-WGC Championship, which also finished on a Monday. The 31-year-old, who completed a third round 70 earlier, was at a loss to explain why he had enjoyed success at larger events.
"Just one of those things," he said. "I wish I could explain it because if I could work it out, I would do it in all tournaments."
Spain's Garcia, aiming to overhaul Mickelson as world number two, dropped his first shot of the week at the 11th hole of his third round and was disappointed with a par-72.
"I just played poorly the last eight holes," he said. "That's pretty much it. It's a shame because the way we were going, we could have finished probably 12, 13 under quite easily."
The Spaniard sank an 11-foot birdie putt on the second of his fourth round holes but returned to 10-under after missing a much shorter par chance at the third.
American Mickelson, who shot a third round 70 to move to 10-under, also looked like dropping a shot early in his final round after finding the water at the second, but a 12 foot putt kept him at level par, two shots off the pace.
"I would love to try and defend my title, and getting in position within two shots of the lead is a good start," he said.