Chris Stewart, winner of the 1981 Baltimore City Marathon and a British 5,000 meter champion, and Dan Rincon of Silver Spring, winner of the 1980 Hecht's 10 Miler, are the favorites in the men's field in Sunday's fifth Hecht's 10-Mile Race, beginning and ending at the Carter Barron Ampitheatre playing fields at 16th and Kennedy streets NW.

Jack Fultz, who won the race last year and finished first in the Boston Marathon in 1976, had been expected to compete, but injured his foot in a race last weekend and is unlikely to run Sunday.

Among the women, Cynthia Lorenzoni of Charlottesville, the first female finisher in the Hecht's race and the Marine Corps Marathon last year, returns. Other leading contenders are Mary Walsh of Silver Spring, a former all-America in the 10,000-meter run at the University of Maryland and the top female finisher in the 1980 Hecht's race, and Debra Pavik of Lutherville, Md., a 3,000-meter all-America at Maryland.

As many as 2,000 runners are expected to participate in the race.

Al Naylor, vice president of the Washington Running Club and race director, said that because of the hilly terrain and the usual heat and humidity this time of year, the race is considered one of the more difficult 10-milers on the East Coast.

Runners may register for the race today between 1 and 3 p.m. at the downtown Hecht's store, 7th and F streets NW, in the men's department on the first floor. Entry fee is $5, $1 of which goes to Big Brothers of the National Capital Area. The race sponsors -- Hecht's, Adidas and Van Heusen -- will match each dollar going to Big Brothers. There will be no registration the day of the race.