Lois Neil, a 23 handicap player, shot her career best round of 83 at Tantalon yesterday to win the fifth annual Oldsmobile Classic but Mary Ann Battle, current Maryland amateur champion, stole the show with a gross 69, three under par.

The tournament, for the benefit of Heroes, Inc., a group dedicated to helping widows of policemen and firemen killed in the line of duty, is expected to net about $5,000 for the fund. A total of 1,241 women from 43 Washington area clubs competed in the preliminaries with 132 finalists playing yesterday. All entry fees are donated to Heores, Inc.

Neil, who plays out of International, started off with a birdie and a par. She was out in 40 and home in 43 and carded seven pars in addition to her birdie.

Battle hasn't been playing well since winning the Maryland title last summer but now is looking forward to the various women's tournaments in the metropolitan area and the U.S. Women's Amateur.

"I give all the credit to my home pro at Montgomery Village, Don Gondry," she said. "Don really took my swing apart and put it back together so I can play decently."

Battle was out in 34 and back in 35. She didn't have a bogey in her round. She registered 15 pars and three birdies, two on 10-foot putts and the last when she chipped to within two feet on the 13th.

Lee Elder, Washington's touring golfer, donated four entries for his annual tournament Sept. 2, 3 and 4 at Kings Mill Country Club in Williamsburg, Va. This is the annual tournament for the Lee Elder Foundation to help inner-city children. His wife, Rose, played as a special guest and had and 87. She has an 18 handicap.