Three players shared the net lead after the first day of the 46th Annual Keefer Cup Handicap Championship held at Chevy Chase yesterday. A total of 34 women, out of a starting field of 54, had net 79 or better to qualify for the final 18 today.

The net leaders at 71 were Sharon Briggs of Montgomery Village, Jody Evans of Chevy Chase and Betty Looney of Army Navy. Sue Keeney, 1975 District champion from Army Navy had the best gross score of the day, a three-over-par 74.She and her clubmate, Nancy Hollenbeck, who won this title in 1975, were the only ones to break 80. Hollenbeck had a 78.

Rebecca Doman, a four-time Keefer winner and the defending champion, had a rough start, carding an 84 that with her seven-handicap, gave her a 77.

Briggs had a gross 82, going out in 41 and returning with the same score. She played steadily, registered seven pars. Looney, who carries a 13-handicap had an 84 with nines of 43, 41. She had six pars. Evans, who has a 14-handicap, had an 85, going out in 43 and coming home in 42. She had six pars but was but on the finishing holes, carding double bogeys on the 16th and 17th and a bogey on the 18th.

Keeney, who carries a two-handicap, was out in one-under-women's-par of 35 with birdies on the second hole, when she ran in an 18-foot putt, and on the ninth when she put a nine-iron inches from the pin.

But she slipped on the back nine. She bogeyed the 11th when she landed in a trap and the 14th when she missed a short putt. She double-bogeyed the 16th when she put a ball in the water, and bogeyed the 17th. She holed a 40-footer on the 18th for a birdie.

Hollenbeck had a pair of 39s for her round. She started out badly, carding a bogey on the first hole and a double bogey on the second. She had her only birdie of the round on the par-five third hole. Hollenbeck bogeyed the fourth and then came in with five straight pars. She had five pars and four bogeys on the back.