Scott Verplank became the first amateur in six years to lead a PGA tournament, shooting four-under-par 68 for a one-stroke advantage after the first round of the Western Open. Bobby Clampett was the last amateur to do it, sharing the first-round lead of this tournament in 1979.

Verplank played the back nine at Butler National Golf Club in Oak Brook, Ill., in three-under-par 33 to lead Danny Edwards, Dave Ogrin, Larry Rinker and rookie Ernie Gonzalez, all at 69.

Defending champion Tom Watson had two double bogeys for a 74. Seve Ballesteros had 75, Jack Nicklaus 76 and money-leader Curtis Strange 77 . . .

Nancy Lopez birdied, Lauren Howe bogeyed and Colleen Walker double-bogeyed the final hole to share first place at two-under-par 70 after the first round of the Toledo Classic.

Defending champion Lauri Peterson was at 71, along with Deedee Lasker and Dianne Dailey. Only six players bettered par 72 at 6,220-yard Glengarry Country Club . . .

Penny Stallins of Roanoke and Donna Andrews of Lynchburg won semifinals in the 60th Virginia Women's Amateur in Hot Springs. Stallins shot two-over-par for 16 holes to beat Brenda Seymour of Reston, 3 and 2. Andrews edged Marie Winks, 1 up. They play 18 holes for the title today at the Cascades Course. Mary Jane King of Newport News defeated Ruth Ann Verell of Alexandria, 3 and 2, for the senior women's title. King had birdies at the 13th and 14th holes . . .

Hap Peden of Argyle won the Montgomery Sentinel Juniors golf championship at Redgate by defeating Bert Moreno of the host club, 2 and 1, in the morning and Montgomery Village's John Nelson, 5 and 4, in the afternoon. Nelson had advanced to the finals with a 7-and-6 win over defending champion Mike Svec of Columbia . . .

Johnny Miller took a one-shot lead in the Scandinavian Enterprise Open tournament in Stockholm with a six-under-par 66.