ROY JONES went from being a great middleweight to a dominating light heavyweight, picking up about 15 pounds and disappearing almost completely. Maybe that isn't fair because the ratings for his HBO fights, no matter how late they come on, no matter who his no-name opponents are, keep gaining weight, too. If this trend continues, if people can't get enough of his one-sided fights, you might as well put a circle around Jan. 9. That's when Jones gets back into the ring against Ricky Frazier, a sweet guy who is the WBC's No. 1 contender. Here's what else he has going for him: He's a cop, working out of Harlem's 26th Precinct. He almost never gets knocked out. There, I think that's it. Frazier, 39, has been boxing professionally for six years. You wouldn't know his name unless he arrested you. His last fight, in August, was scheduled for eight rounds. The fight before that he collected the largest purse of his career, $12,000. Buying lottery tickets makes more sense. There's disappointment but no pain. "I'm the lowest-paid No. 1 contender there ever was," Frazier said yesterday at a press conference. "I don't know why. They must say, 'He's a cop, we can't rob him.