When you're winning as much as Hale Irwin, they can't all be pretty.

A week after tearing the field apart in the PGA Seniors' championship, Irwin found another way to win Sunday in the Las Vegas Senior Classic.Some shots went sideways and his putts kept rolling around the hole, but Irwin made the putt that mattered the most on the 18th hole to beat Isao Aoki by a shot for his second win in a row.

It was the fourth win in seven senior events for Irwin this year, the hottest start ever by a golfer on the Senior Tour.

"Those were probably some of the ugliest shots you'll see played out there," Irwin said. "I just never got into feeling confident about things. I'm glad it's over."

Irwin, who allowed Aoki to tie him by missing a short putt on 17, his third short putt miss in four holes, rolled in a 15-foot birdie putt on the final hole for a 1-over 72.

It was only Irwin's third over-par round in a year that has seen him win $746,531 in seven tournaments.

"I was leaking oil and throwing loose parts all over the place," Irwin said. "I could be the luckiest man out there today."

Winds gusting to 50 mph played havoc with the field, and only four golfers finished the event under par. After defending champion Jim Colbert double-bogeyed the 10th hole, it was basically match play between Irwin and Aoki, who shot even-par for the day.

Tied after 17, Aoki was just off the fringe on the 18th green and missed a 20-foot putt by inches. Irwin, who three-putted three times in the final round, then rolled his putt into the cup to avoid a playoff.

"I saved the best putt of the day for last," Irwin said. "I surely didn't want to go back out there again because I had no momentum."

Irwin finished the 54-hole tournament at 6-under 207, while Aoki was at 208. Jim Colbert and John Jacobs, who finished at 2-under 211, were the only other players to break par for the tournament.

With the win, Irwin claimed the fastest start in Senior PGA Tour history and got his eighth win in 42 starts since joining the tour in the summer of 1995.

Irwin had led by two shots going into the final round and had the same lead over Aoki after both players bogeyed the par-4 14th. But Irwin, who missed a short putt on 14, missed putts within 5 feet on 15 and 17 to fall back into a tie with Aoki.

With the tournament on the line, though, Irwin put his 15-footer straight into the hole, pumping his fist into the air as it got near.

"If we had an easy day without the wind and I'd putted like this, I wouldn't be here," Irwin said.

Aoki also had problems hitting greens, but knocked it in twice from off the green to stay in contention.

"I'm just happy with even par today," Aoki said. "The wind was between the mountains and swirling, and I couldn't judge it."

Both players drove into the right rough on the par-4 finishing hole at the TPC at the Canyons in Summerlin course. Aoki, hitting first, put his second shot on the back fringe about 20 feet from the hole.

Irwin then hit a sand wedge 15 feet right of the hole. After Aoki's putt slipped off to the left, Irwin rolled his putt into the center of the cup for the win.