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OKLAHOMA CITY (AP) _ Hale Irwin moved a bit closer to senior tour history Friday, shooting a 5-under-par 67 in his second round of the day to take the lead midway through the rain-delayed Senior Tour Championship.

Irwin, seeking to become the first senior golfer to win $3 million in a season, has a two-round total of 7-under 137. That was one shot better than defending champion Bob Gilder and Gil Morgan, and two ahead of Larry Nelson.

Irwin needs to finish fourth or better in this season-ending event to eclipse $3 million.

He and Gilder have each won four times this year and are leading contenders for player of the year. They played 36 holes together Friday after not getting started Thursday because of heavy rains that caused the round to be suspended.

On a day when the high temperature was 50, Irwin shot a 2-under 70 in the morning and then began his second round at Gaillardia Golf & Country Club.

He reached 7 under for the tournament with a birdie on No. 10, then made pars the rest of the way.

Gilder matched Irwin's 70 in the first round and also shot 32 on the front nine of the second round before making a bogey on 15 to drop to 5 under. He got that stroke back with a birdie on the par-5 18th.

Morgan, who lives in nearby Edmond, moved into a second-place tie with a bogey-free 67 in the afternoon. He got started with birdies on the first two holes and added three more on the back nine.

Nelson got to 6 under with three birdies on the back nine but bogeyed the 18th. He is seeking his first victory of the year.

Walter Hall had the first-round lead with a 69, then shot even par in the second round to remain at 3 under for the tournament. Others at 3-under 141 included Tom Watson, Fuzzy Zoeller and Rodger Davis.

Davis birdied three of his first four holes Friday to briefly take the first-round lead at 5-under. But two bogeys, a birdie and a double-bogey over the final seven holes left him with a 70, and he followed that with a 1-under 71 in the afternoon.

In the Super Seniors event for players 60 and older, Gibby Gilbert held the lead at 4 under after shooting 69 in the second round. Larry Ziegler had a 68 and was at 2 under.