Sally Voss of Congressional and Nancy Maunder of Crofton eliminated semifinal opponents yesterday and will meet at 9.45 a.m. today for the Maryland Women's Amateur championship at Woodmont's South Golf Course.

Voss, who was 4 down with five holes to play, defeated Bonnie Johnson of Maryland Golf and Country Club, 1 up, with a 40-foot birdie putt on the final hole. Maunder led at the turn, 2 up, and held on for a 3-and-2 triumph over Karen Smith of Potomac Valley.

Voss, a 20-year-old All-America at Stanford, was 1 down at the turn. She three-putted the 10th and 11th holes to go 3 downs, then Johnson made a birdie on the 13th as Voss fell 4 down.

Voss won the next two holes with pars, then used a birdie on the 16th and a par on the 17th to even the match. Johnson's only par during the final five holes came on the 16th.

Smith pulled within one hole of Maunder by winning the 14th, but Maunder closed out the match by winning the 15th (par) and 16 (birdie).

In championship consolation, Tina Marolow of Woodmont defeated Andrea Francus of Chesnut Ridge, 8 and 6, and Carol Taylor of Worthington Valley beat Trish Horan of Argyle on the 20th hole.