Jim Thorpe, the leading money-winner remaining (No. 16 on 1985 PGA Tour) in the Tucson Match Play Championship, used two quick birdies on the Randolph North course's back nine to seal a 6 and 5 victory over Mark Wiebe and move into the semifinals.

Mac O'Grady eliminated defending champion Tom Watson, 1 up. Down 3 at the turn, Watson came back and had a chance to force extra holes, but missed a 20-foot birdie putt on the 18th that would have tied the match. O'Grady then ran in a 12-foot putt for par and the victory.

"He just played better than I did," Watson said. "He finished like a true champion at 18 with his putt for par." O'Grady, as is his wont, had nothing to say for public consumption.

Two of the lowest-ranked entrants, Bob Tway and Jack Renner, also won quarterfinals. Tway, No. 76 on the money list, birdied the first four holes and ousted Danny Edwards, 6 and 5. Renner, No. 71 in earnings, took Philip Blackmar, 4 and 3 . . .

Defending champion Gene Littler sank an 18-foot putt for par on the second extra hole against Jim Ferree to move into the quarterfinals of the Senior division. Peter Thomson, leading money-winner on the 1985 Senior PGA Tour, hit into a water hazard on the 18th hole and lost to Harold Henning, 1 up. "I hit a six-iron, but had a really bad lie," Thomson said.

Lee Elder coasted past Gay Brewer, 5 and 4. Dan Sikes beat Doug Ford, 4 and 3.