The Greenkeepers had to wipe out hailstones at Pebble Beach in the final round on Sunday

Phil Mickelson leads AT & T Pebble Beach's Pro-Am by three shots with two holes to play after the suspension of the last round because of the dim light.

The American is on 18 with less than two holes to play, with his partner Paul Casey on 15 under.

The light fading, Mickelson was keen to finish the round by saying, "I see it well," but Englishman Casey chose not to sign the 16th.

"I understand exactly where Paul is coming from," Mickelson said later.

"It's dark and we have a chance to go out on cool greens on Monday, I have a pretty good vision, I play well and I wanted to continue."

The start of the day was delayed one hour for rain and stopped again for two hours when a hail storm hit the California course.

American Scott Stallings is leading the club with 15 under par with 66 under par, while Jason Day finishes on 13 under, tied with South Korean Kim Si-woo.

The overnight leader, Casey, had a three-shot lead over Mickelson early in the day, but the big winner five times bridged the deficit with three birdies in the first nine and three more after the turn.

"There is still a glow," said Casey about his chances, which was tied for his round when the game was suspended. "I have to do something special."

Phil Mickelson was getting closer to a fifth win at the AT & T Pro-Am Beach, California, when the game was suspended due to darkness.

The American, who started the last round of three shots at Pebble Beach, finished with a lead of three strokes and two holes to play.

After a late start in the rain, Mickelson produced a clean round and had six birdies to go below the 18 before the game was canceled.

Third-round leader Paul Casey, who mixed two birdies with two birdies, was 15 cents with three holes remaining, tied with Scott Stallings who finished with a 66.

Australian Jason Day and Si Woo Kim, of South Korea, were in the clubhouse at 13 under.

Scot Russell Knox closed to nine under-balls after a round of level 72 in the fourth round, a shot better than Northern Irishman Graeme McDowell.