Shari Mann, 14, of Potomac edged Lisa Zeis, 15, of Cheektowaga, N.Y., by five-100ths of a point last night to win the McDonald's Capital Gymnastics Invitational before a crowd of 3,700 at George Washington University's Smith Center.

Mann, a student at Herbert Hoover Junior High School, scored 38.65 points overall by getting a 9.50 in side horse vaulting, 10 on the uneven parallel bars, 9.65 on the balance beam and 9.50 in floor excercise. Zeis' final score was 38.60.

"When she got the 10, that put her solid," said Larry Moyer of Reding, Pa., coach of U.S junior national champion Chris Reigel, who put on an exhibition between events.

"I trained real hard this past week," said Mann, surrounded by young autograph seekers. "I thought of each routine as it came and took the cue from my coach."

Mann's coaches, Margie and Greg Weiss, operate MG Gymnastics in Rockville and were the organizers of this event.

In the uneven bars, Mann did a Stalder free hip circles to a hand stand and dismounted with a Hecht back somersault.

One the blance beam, in which she tied for first with Zeis, her routine included an original move of a handstand lowered to a hip circle around the beam, two backhand springs and a full twist dismount.

Mann's floor routine, the final phrase, was not her strongest."She's not dancing elegantly," said Moyers, watching from the sideline. "Her routine is very crude and she's bouncing too much."