ATLANTIC CITY, N.J. (AP) _ Stephan Johnson was given oxygen and taken from the ring on a stretcher after he was knocked out in the 10th round by USBA junior middleweight champion Paul Vaden on Saturday night.

The two men were exchanging punches in the middle of the ring when Vaden landed a stiff jab and Johnson staggered backward. Vaden missed with a big right, but landed a left to the head and Johnson went down. The back of his head hit the lower stand of rope and the upper part of his body landed on the apron.

Referee Earl Morton started a count, but stopped at four and medical personnel rushed into the ring.

After several moments, Johnson was given oxygen, strapped to a stretcher, taken from the ring and taken to a hospital.

``It doesn't look good,'' said Dr. Charles Wilson, who treated Johnson at ringside. ``He's still breathing, but it's shallow. He's very slow responding, he's semi-conscious.

``He took a bad hit on that last one. He looked like he might have seized when he hit the ground.''

The scheduled 12-round fight was on the undercard of the Michael Grant-Andrew Golota heavyweight bout in an arena at the Trump Taj Mahal.