In West Orange, N.J., defending champion Scott Verplank of Dallas parred the second extra hole to defeat Walker Cup teammate Randy Sonnier, 1 up, in the opening round of match play in the U.S. Amateur championship. Sonnier, of Woodlands, Tex., had forced the extra holes by winning the 17th and 18th with birdies.

Medalist Sam Randolph of Santa Barbara, Calif., beat Mike Schuchart of Lincoln, Neb., 1 up. Randolph, a University of Southern California golfer who tied the 36-hole qualifying mark with a six-under-par 134, was one down after 15 holes, but won the 16th and 17th with birdies.

Jim Estes of Rockville was defeated by George Marucci of Villanova, Pa., 1 up. Two-time U.S. Amateur champion Jay Sigel of Berwyn, Pa., defeated Kirk Triplett of Reno, Nev., 2 and 1. Walker Cup members Bob Lewis and Duffy Waldorf also won opening-round matches . . .

Joey Sindelar, who won his only PGA Tour title in April, shot a five-under-par 66 to tie veteran Bruce Lietzke and second-year player Brett Upper for the first-round lead in the $300,000 B.C. Open in Endicott, N.Y. The trio was a stroke ahead of Mike Reid, Denis Watson, Andy Magee and Don Pooley. Forty-two of the 141 players broke par at the 6,966-yard En Joie Golf Club, a tight but relatively short public course.