Darryl Tyson ran his lightweight professional record to 18-1 with a unanimous 10-round decison over David (Bad Boy) Brown last night at the Washington Convention Center.

Brown, of Elizabeth, N.J., came into this fight with one day's notice after Tyson's scheduled opponent, Pedro Montero, was unable to make it from Santo Domingo. Brown went the distance, blocking punches and trying to wear down Tyson.

"We fought the same way last time," said Tyson, who fought Brown in a split decision last November. "He had a very good defense. I just tried to tap him until I got an open shot."

After a deliberate first round in which the only punch connecting was Tyson's left jab, Tyson began leading with his left and following with right overhands to Brown's face in the third round. By the end of the round, Tyson had Brown against the ropes and connected with two clean left hooks before the bell sounded.

The pace picked up in the fourth round and quickly Tyson had Brown right back where he had him in the third round -- against the ropes. But Brown blocked many of the punches, then started his own flurry, connecting with a right and a left hook to Tyson's head. Tyson responded with combinations but then was forced to grab Brown to rest.

Brown successfully blocked Tyson's punches for most of the fifth round but near the end, Tyson had him against the ropes and connected on left upper cuts followed by over hands.

In the 10th round, Tyson was backed against the ropes. Towards the end of the round, though, he scored with rights to the head and left hooks to the body.

The three judges awarded Tyson scores of 100-87, 100-91 and 99-90.

Earlier, Edward DeJesus of Camden, N.J., scored his fifth career knockout over Tracy Williams of Washington with 1:15 gone in the first round in his lightweight bout.

In a light heavyweight match, Jack Johnson of Washington defeated Charles Price of Washington on a technical knockout in the seventh round.