Ayako Okamoto of Japan shot 77 yesterday in Woburn, England, for a four-round total of 289 that won the $200,000 British Women's Open by 11 shots over Betsy King (74) and Dale Reid (76).

Okamoto, 33, won $32,300. She began yesterday's round 11 shots ahead and maintained that margin. She shot 38 on the front nine and finished her round with an eight-foot putt for birdie 3.

Pat Bradley, who started the day in second place, shot 78 to share fourth with Jan Stephenson (75) at 301, one shot ahead of Irish amateur Mary McKenna (73). Lauri Rinker shot 77 for seventh at 303, one shot ahead of Cathy Marino (72) and Amy Alcott (78) and two in front of Kathy Whitworth (73) . . .

With front-running Jim Colbert falling victim to wet sand in two bunkers and shooting 73, Calvin Peete came from four strokes behind with a 66 to take a two-shot lead in the third round of the $350,000 Texas Open in San Antonio . . .

In St. Nom la Breteche, France, Severiano Ballesteros shot a three-under-par 69 for 206 to maintain a two-shot lead over Eamonn Darcy of Ireland and Bernhard Langer of West Germany after three rounds of the $140,000 Lancome Trophy tournament. Johnny Miller was at 211 . . .

Bob Toski defeated Miller Barber and Rod Funseth beat Billy Casper in sudden death to advance to the final round of a $125,000 seniors tournament in Cape Elizabeth, Maine . . .

Davis Love III of Sea Island, Ga., shot two-over-par 72 for a three-round total of 210 to take a five-shot lead into today's final round of the 82nd Middle Atlantic Golf Association Amateur at James River, Va. Mike Ancel of Newport News and Greg Rohlf of East Chester, N.Y., are Love's closest pursuers. Dave King of Bethesda was the closest Washington area player, in sixth place at 220 . . .

Paul Ryan was declared the outright winner of Friday's Middle Atlantic PGA pro-am tournament at International after a scoring mistake was discovered. Ryan originally was thought to have shared first place with three others at 72. But Ryan realized yesterday, a day after he turned in his score, that the numbers on his card added up to 71.