Adrian Leek's record-setting victory yesterday in the Hecht's 10-Miler was as hot and clear as the weather.

The 25-year-old Johnson City, Ky., resident posted a time of 49 minutes 34 seconds to break the record of 50:00 set by Dan Rincon of Wheaton in 1980.

Don Norman (51:02) of Republic, Pa.; David O'Keefe (51:21) of Greenbelt and Dave Patterson (51:47) of Norristown, Pa., followed in the race that wound through Rock Creek Park.

Eleanor Simonsick, 25, of Baltimore also won decisively in the women's race. She finished ahead of Kathleen Hibbert (64:04) of Rockville and Liz Cunningham (66:07) of Crofton with a time of 59:41.

Defending champion John Doub of Waynesboro, Pa., led Leek and O'Keefe, 24, a graduate student at Maryland, through a blazing 4:30 first mile, as the leaders cruised down the first hill to begin the first 3 1/2-mile loop.

By the time Leek had completed the first loop shortly after four miles, he had taken a 200-yard lead over O'Keefe, who by now was out of sight in second place. Patterson, of the Adidas Racing Team, and Norman, of the New Balance Racing Team, were side by side in third, more than another 100 yards back.

As Leek finished the second loop after eight miles, ascending the last long and winding road, his stride was strong. The battle for the rest of the top five places also was all but settled. At the top of the last hill and just before the nine-mile mark, Norman caught O'Keefe and sprinted past into second place by 15 yards. Patterson trailed by 75 yards in fourth.

Leek turned the corner at 16th and Kennedy streets and crossed the field toward the finish line, the Carter Barron Amphitheater in the background. He waved to the crowd as he broke the tape.

In the women's race, Simonsick had a two-minute lead over Hibbert by midrace, with Cunningham trailing by a half-minute. Simonsick, who ran a 53:46 in the Cherry Blossom 10-Mile last March, will compete at 3,000 meters at the TAC National Championships in Indianapolis in two weeks.