Jason Dufner shot a 9-under 63 Saturday to take the lead at the midway point of the rain-delayed Canadian Open.

Dufner completed two rounds at 13-under 131 for a one-stroke lead over Jerry Kelly (67) and Scott Verplank (67). Nathan Green (65) and Peter Tomasulo (68) are tied for fourth at 11-under 133.

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

The tournament is scheduled for a 36-hole finish Sunday after three straight days of heavy rain that dumped more than two inches of water and caused nearly 12 hours of weather delays.

It was raining steadily when the second round was completed just before 3:30 p.m. local time Saturday.

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. Sunday.

Officials said they hoped to get the final two rounds in by Sunday night.