Mike Weir notched the tournament's seventh hole-in-one, a PGA Tour record, on Sunday. (David Donnelly photo)

Officials organizing the Canadian Open at the Glen Abbey Golf Club were hoping to finish rounds three and four on Sunday.

Instead, more rain pummelled the course in Oakville, Ont., forcing another delay in the morning. Six hours later play was called, pushing the completion of the third round to Monday at 7:30 a.m. ET. The plan is to try and stage the fourth and final round immediately after.

"If we don't think we can get it in [Monday], we'll reassess it then," said tournament director Bill Paul. "Our goal is to get in 72 holes."

The last time the Canadian Open finished on a Monday was 1988.

Jason Dufner, the second-round leader, remained on top after play was suspended. He was 1-under through six holes and 14-under for the tournament.

Anthony Kim and Jerry Kelly sit in a tie for second at 13-under. Retief Goosen, Scott Verplank, Bob Estes, Michael Letzig and Peter Tomasulo were another stroke back.

Canadian Mike Weir sent the crowd into a frenzy with a hole-in-one on the fourth to pull himself back into contention. The ace was the seventh of the tournament — easily breaking the previous record of four since the tour began keeping track in 1971.

Weir assessed 1-shot penalty

Weir was four shots behind Dufner and playing the 11th hole when the horn sounded to halt play Sunday morning. However, during the delay he was asked by the rules committee to go back over video from the end of his round on Saturday and ended up taking a one-shot penalty as a result.

Weir signed for a birdie at No. 18 and a second-round 66 on Saturday following a lengthy delay in which the rules committee reviewed tape and found that he hadn't grounded his club prior to having the ball move in the fairway.

However, the committee reopened the incident Sunday and was unable to account for what caused his ball to move — a grey area in the rules that goes against the player.

As a result, Weir asked to have the penalty assessed and went five shots back of Dufner at 9-under for the tournament. That puts Weir in a tie for 15th with five other golfers.

Glen Abbey has been hammered by rain the entire weekend, forcing lengthy delays and causing streams to run down fairways and greens while giant puddles formed in bunkers.

"Instead of reading the grain, you have to read the current out there," Weir said.

Ideal scoring conditions

However, a wet course also makes for ideal scoring conditions.

With the softened Glen Abbey greens acting more like dartboards and players being allowed to use preferred lies in the fairways, birdies are the norm as golfers flirt with sub-60 rounds.

And when a player aces a hole at the tournament, he wins a BMW Z4. Tournament organizers will have to pony up at least seven of the expensive cars, and that total could grow on Monday if the rain continues to fall.

With files from The Canadian Press