PONTIAC, Mich. — Timothy Bradley moved a step closer toward a megafight that could make him a boxing superstar — though he might have to beat Devon Alexander again to get there.

PONTIAC, Mich. — Timothy Bradley moved a step closer toward a megafight that could make him a boxing superstar — though he might have to beat Devon Alexander again to get there.

Bradley defended his WBO 140-pound title and took Alexander's WBC belt, winning a unanimous technical decision after the fight was stopped in the 10th round Saturday night at the Silverdome.

The ringside doctor ruled Alexander couldn't keep his right eye open and halted the fight at 1:59 of the 10th after an accidental head-butt.

"If that's the best in the world, that's weak," Bradley said.

Alexander said: "I couldn't see, so they had to stop the fight."

Bradley (27-0) handed Alexander (21-1) his first loss in the biggest fight for each rising star.

"He'll be a world champion again some day," Bradley said.

Both fighters took a risk by taking a bout either could lose, but the payoff could be huge.

The 27-year-old Bradley took a step toward a possible fight with Manny Pacquiao or Floyd Mayweather Jr. down the road, but WBA super lightweight champion Amir Khan could be his next opponent.

In a fight that had to be tough to score with each fighter throwing a flurry of punches, the judges all had Bradley ahead in the bout — 97-93, 96-95 and 98-93 — when it was suddenly halted because Alexander's right eye was burning so much he couldn't open it.