Joey Sindelar, a crowd favorite from nearby Horseheads, N.Y., shot a 2-under-par 69 to increase his lead to eight strokes after three rounds of the $400,000 BC Open in Endicott, N.Y. Sindelar, who had earlier rounds of 65 and 63, was at 16-under-par 197. In second place is Jeff Sluman, who shot 68.

The eight-stroke lead is the largest 54-hole lead on the PGA Tour this year and the second-largest third-round lead on the tour in the last 17 years. Jack Nicklaus had a nine-stroke lead after three rounds of the 1973 Ohio Kings Island Open.

Tony Sills and Tim Simpson were in third place at 206 . . .

In Springfield, Ill., Mary Beth Zimmerman shot a 5-under-par 67 to take a one-stroke lead after the first round of the LPGA's Rail Charity Golf Classic. Nancy Lopez, Missie McGeorge and Kathy Postlewait shot 68s and Barb Bunkowsky, Rosie Jones and Becky Pearson were at 69.

Two-time defending champion Betsy King and Ayako Okamoto were among those at 70 . . .

In Lexington, Ky., Bruce Crampton shot 7-under-par 63, setting a 36-hole PGA Senior Tour record and taking a seven-stroke lead in the $225,000 Bank One Senior Golf Classic. Crampton is at 13-under 127 for the tournament.

Miller Barber is in second place with two straight rounds of 67s on the 6,640-yard course.

Crampton, whose $297,821 puts him in second place in this year's senior tour earnings behind Chi Chi Rodriguez, had birdies on Nos. 4, 7, 8, 12, 14, 16 and 18. His only bogey came on the sixth hole.