Oakville, ON (My Sportsbook) - Jason Dufner posted a nine-under 63 on Saturday to grab the lead, as the rain-delayed Canadian Open finally reached its halfway point.

Dufner completed two rounds at 13-under 131 for a one-stroke lead over Jerry Kelly (67) and Scott Verplank (67), while Nathan Green (65) and Peter Tomasulo (68) stood another shot further back at 11-under 133.

Retief Goosen (69) and Camilo Villegas (71) led a six-way tie at 10-under 134.

The tournament is headed for a 36-hole finish on Sunday following three straight days of heavy rain that dumped more than two inches of water on the Glen Abbey course and caused nearly 12 hours of weather delays.

It was raining steadily when the second round was completed just ahead of 3:30 p.m. local time on Saturday, and the grounds crew was pulled off the course as more strong weather approached.

Officials were hoping to get in several hours of play ahead of the 8:50 p.m. sunset, but Mother Nature didn't cooperate. They couldn't get the course into playing shape in time to start the third round.

Instead, the field was trimmed to 64 players, who will go out in threesomes off the No. 1 and No. 10 tees starting at 6:45 a.m. on Sunday. Provided the course is in playing shape by then, officials hoped to get the final two rounds in by Sunday night.

PGA Tour tournament director Steve Carman said the biggest problem areas were on five soaked fairways on the front side. The grounds crew will focus on those spots and other troubled areas overnight in hopes of getting the course ready for the restart.

"They've got a lot of work to do," said Carman.

Seventy-six players made the cut at three-under par or better, but only 64 will get a chance to play Sunday according to a PGA Tour rule that requires a cut to the number closest to the top 60 players on the leaderboard in the event of a 36-hole Sunday finish.

The players who made the original cut but missed the top 64 will get paid according to their position at the end of the second round.

"This has been such a crazy weekend," said Canada's Mike Weir, who was tied for 20th place. "At least today I was able to play 18 holes and actually get in some kind of a rhythm, where the first round was play three holes, stop for seven hours, play some more ... For me it was just tough to get any rhythm going in that first round, and today at least we got the second round in."

The rain-softened greens helped one player break a long-standing PGA Tour record on Saturday.

Mark Calcavecchia made nine consecutive birdies to set a new tour mark, taking dead aim at the pins during a stretch that saw him hit only two approach shots outside 12 feet.

Calcavecchia's streak started on the par-three 12th -- his third hole of the second round -- where he knocked his tee shot to three feet.

It continued to No. 2 on the front side of the course, a 520-yard par five, where Calcavecchia reached the green in two shots and two-putted from 27 feet.

Calcavecchia, 49, parred No. 3 to stop the streak at nine birdies, then went on to bogey the fourth and eighth holes to shoot a seven-under 65. The 2005 Canadian Open winner was eight-under 136 and tied for 17th place.

"That was certainly fun," said Calcavecchia, who had opened with a 71 in the first round. "I just got on a great streak. I knew I needed to play a good round just to make the cut."

He broke the previous record of eight consecutive birdies originally set by Bob Goalby at the 1961 St. Petersburg Open. Goalby's mark was matched by five other players: Fuzzy Zoeller (1976 Quad Cities Open), Dewey Arnette (1987 Buick Open), Ed Fryatt (2000 Doral-Ryder Open), J.P. Hayes (2002 Bob Hope Chrysler Classic) and Jerry Kelly (2003 Las Vegas Invitational).

Calcavecchia, whose 13 PGA Tour victories include the 1989 British Open, also owns a share of the PGA Tour record for most birdies made in 72 holes. He made 32 of them while winning the 2001 Phoenix Open (now the FBR Open).

Dufner, meanwhile, came within a shot of tying the tournament scoring record for one round.

He hit nine of 14 fairways and 13 of 18 greens in regulation -- fair numbers that were buoyed by the fact that he only took 24 putts in the round. Dufner collected an eagle and eight birdies, but failed to get up-and-down from a greenside bunker at the 17th on the way to his only bogey.

Dufner then hit into the water on his approach at the par-five 18th and saved par to miss tying the tournament scoring record of 62, which is shared by four players.

"I think it enters everybody's head when you get that low, once you realize how low you are," said Dufner, who played the end of his round in the rain. "Sometimes you don't realize it."

Briny Baird also shot a 63 Saturday in a round that included a hole-in-one at the 15th. He moved into a tie for 12th place at nine-under 135 alongside Anthony Kim (66) and three others.