Mike Stahr, a recent transfer to Georgetown University from Arizona State, wasted no time making a name for himself locally as he outdistanced 1,385 runners yesterday in the fifth Fritzbe's 10-kilometer road race in Reston.

Stahr, 20, a sophomore sociology major, surged into the lead for good after 1 1/2 miles and finished the 6.2-mile rolling course on a cool, sunny morning in 31 minutes 12 seconds. Reston athletes Thomas Blumer (32:28) and Larry Frederick (33:03) were next.

Jane Newell of Reston broke the course record in winning the women's division in 37:34. Newell, 26, bettered the 39:36 set last year by Becky Nolan of Annandale, third yesterday in 40:00, 13 seconds behind Laura Gaydos of Annandale.

At the same time in Alexandria, Charlie Trayer of Reading, Pa., was easily winning his third Capital 36-Miler through Old Town. Trayer took the lead with a 5:05 mile and never was challenged. He held a five-minute margin after 20 miles and finished in 3:36:13. Trayer, 31, had won the race in 1981 and 1983.

Defending champion Bill Lawder, 38, of Yardley, Pa., was second in 3:48:26. Carole Williams of Washington was the first woman in, in 4:41:37. In the 20-mile event, Jim Dill of Springfield and Mary Ellen Williams of Darnestown won, in 1:49:30 and 2:20:44.