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CHICAGO (AP) _ Bob Gilder won the SBC Senior Open on Sunday when Hale Irwin struggled on the first playoff hole, nearly whiffing at a ball in the high grass and hitting another into the water.

Gilder missed a final-hole putt that would have won the tournament, then returned to the 18th and ended the playoff with a short par putt to earn his first senior tour victory this season.

On the playoff hole, both hit tee shots into the same bunker on the right side of the fairway.

Gilder's second shot went below a cart path into the rough. Irwin's shot hit the cart path, bounced upward and the ball got lodged in high grass.

That's where Irwin, the senior tour's career leader in victories and a three-time champion in this event, really found trouble.

He barely made contact in the grass on his third shot, then knocked his fourth shot out of the grass and completely across the fairway into the water.

Irwin finally reached the green with his sixth shot, pretty much assuring victory for Gilder, last year's tour rookie of the year.

Gilder reached the green with his third shot _ a chip out of the rough _ and two-putted. That dropped Irwin's record in senior tour playoffs to 0-4.

Gilder, who shot a course-record 63 Saturday, made a 10-footer on the 16th to tie Irwin at 12 under.

Gilder's chance for victory in regulation ended when his putt from about 10 feet rimmed out on No. 18, sending the tournament to its first playoff. He shot a 71 Sunday.

Irwin, who shot a final-round 66 while playing four groups ahead of Gilder, had to wait to see if he would win or go to a playoff. He watched from a golf cart, went out to practice and then returned to see Gilder miss his chance to win on the 18th.

With temperatures in the upper 90s at Harborside International, Irwin shot 3 under on the front nine and pulled into a tie with Gilder at 10 under by making a birdie at No. 11.

Irwin then took a lead into the clubhouse at 12 under with birdies at the 13th and 17th holes.