Curtis Strange one-putted 12 times in a misty rain yesterday to shoot a 4-under-par 66 and take a two-stroke lead after the second round of the $800,000 World Series of Golf at Firestone Country Club in Akron, Ohio.

"Any time I shoot 66 at Firestone, I've got to be putting good," said Strange, who has a 36-hole total of 136, 4 under par.

Bobby Wadkins, three shots ahead of the field after a first-round 64, did not make a birdie yesterday, shooting a 74 that dropped him into a tie for second at 138 with Paul Azinger and Fred Wadsworth.

Provident Classic: Rocco Mediate made two eagles on his way to a 7-under-par 63 and a one-stroke lead over Joey Sindelar after two rounds of the $450,000 Provident Classic at Valleybrook Golf and Country Club in Chattanooga, Tenn.

LPGA: Ayako Okamoto of Japan shot a 4-under-par 68 to build a three-shot lead at the halfway mark of the $250,000 World Championship of Women's Golf at PineIsle Resort in Buford, Ga.

Okamoto, winner of 11 events in her seven years on the LPGA Tour, has a 36-hole total of 6-under-par 138.

The season's leading money-winner, Betsy King, shot a 70 for a 141 total in the battle for the richest first prize in LPGA history, $81,500.

First-round leader Kay Cockerill, the two-time U.S. Women's Amateur champion and the only amateur in the select field of 12, shot a 74 and is at 143.

PGA Seniors: Former Masters champion Charles Coody picked up four strokes on the final six holes to gain a share of the first-round lead with Australian Bruce Crampton in the $300,000 Showdown Classic in Jeremy Ranch, Utah. Both players shot 3-under-par 69.

U.S. Amateur: Two-time champion Jay Sigel of Berwyn, Pa. and qualifying medalist Scott Gump won second- and third-round matches to reach the quarterfinals at Jupiter Hills Club in Jupiter, Fla..

Sigel, winner of this six-day tournament in 1982 and 1983, defeated U.S. Public Links champion Kevin Johnson, 3 and 2, in the morning. He came back in the afternoon to eliminate David White, 2-up.

Gump, a former University of Miami star who has said this will be his last tournament as an amateur, overcame a three-hole deficit to defeat Len Mattiace, 1-up, in the second round. He returned two hours later to beat John O'Neill, 7 and 6.

Also advancing to the quarterfinals were Chris Webb, a graduate of Louisiana State, Eric Rebmann of Plantation, Fla., Miles McConnell of Tampa, Fla., NCAA player of the year Bill Mayfair, current LSU player Robert McNamara of Frankfort, Ky., and Stephen Ford of Melbourne, Fla. The winners of this morning's quarterfinals will play the semifinals in the afternoon.

PGA Junior Championship: Jeff Manson of Long Beach, Calif. shot a 1-under-par 71 in the final round to win the boys title at PGA National in Palm Beach Gardens, Fla.

Vicki Goetze of Hull, Ga., won the girls title with a 72.

MAPGA Pro-Am: University of Maryland golf coach Fred Funk shot a 6-under-par 66 to win the Middle Atlantic PGA Montgomery College Foundation Pro-Am at Woodmont Country Club in Rockville.