Nearly 1,800 runners are expected to participate in Hecht's sixth annual 10-Miler Sunday in Rock Creek Park at 8:30 a.m.

The race, which starts and finishes at the Carter Barron Amphitheater parking lot (16th and Kennedy Streets, NW) and follows a hilly course through the park, is conducted by the Washington Running Club in cooperation with Adidas to benefit the Big Brothers of the National Capital Area.

Defending champion John Doub of Waynesboro, Pa., is expected to return this year. Doub, 26, beat Ned Poffenberger by seven seconds to win last year in 50:33.

Dave Patterson of the Adidas Racing Team, who placed third two years ago, and Adrian Leek of Johnson City, Ky., are also prerace favorites. Leek, 25, finished third for the last two years in the prestigious Peachtree Road Race. The course record of 49:50 was set by Dan Rincon of Wheaton in 1980.

In the women's division, Cynthia Lorenzoni of Charlottesville will attempt to repeat her 1982 record-breaking victory, when she won by almost two minutes in 58:22. Eleanor Simonsick, 25, of Baltimore, winner of the 1983 Cherry Blossom 10-Miler, will be Lorenzoni's biggest challenger.

There will be no race-day entries accepted.