Jack Nicklaus tied three records and broke another yesterday in shooting an eight-under-par 64 and taking a three-shot lead over Lee Trevino entering the final round of the Senior Tournament Players Championship in Dearborn, Mich.

Nicklaus, in only his third senior event, is at 19-under 197. The 19 under shatters the third-round senior record of 16 under set last year on the 6,665-yard Dearborn Country Club course by eventual champion Orville Moody. The 197 through 54 holes ties a senior record. At 72 holes, this tournament is a rarity on the Senior PGA Tour.

And Nicklaus's 64 tied the tournament and competitive course records set earlier in the day by Larry Zieg-ler. Ziegler, tied for third with Frank Beard at 12-under 204, was playing with an injured wrist, having damaged ligaments in a freak fall last month in the PGA Seniors Championships.

Trevino, the tour's leading money-winner, is keeping Nicklaus from running away. Playing with Nicklaus, he lost ground despite shooting a 66 for a total of 200. He started the day one shot behind Nicklaus.

"I think I'm the only guy who can catch him," Trevino said. "At three shots back, I'll have to shoot 65 because I don't think Jack is going to shoot badly."

Said Nicklaus: "The scenario is, if I play well, Trevino is probably the only guy with a chance to catch me. But if I don't play well and Trevino doesn't play well, there are other people that could catch us because you can make birdies here."

"I had a great time," the beaming Trevino said. "I would rather play with this man than anyone else in the world. He's the best. You're playing with a living legend. How can you not enjoy playing with him?"

Western Open: Wayne Levi swept past second-round leader Payne Stewart, shooting a two-under 70 to take a one-stroke lead after three rounds in Oak Brook, Ill. Three-time winner Tom Watson is tied for third with Loren Roberts and Mark Brooks, three strokes off the lead.

"It's just one of those courses I match up with," said Watson, a nonwinner in three years, of the difficult Butler National Golf Club course.

Levi, who went five years without a PGA Tour triumph and now is seeking his second victory in three weeks (he won at Atlanta), is at 10-under 206. Stewart shot 72 and Watson 69.

McDonald's Championship: Patty Sheehan (68 -- 205) had three birdies and 15 pars, taking a two-shot lead entering the fourth round of the LPGA event in Wilmington, Del. In second is Barbara Mucha (67 -- 207).