Championship boxing careers generally follow a consistent progression. After turning professional the fighter gets his feet wet in four-round matches and then six-rounders.
Within a few years, he should be built up through eight-rounders to 10. Within about four to five years, he should be ready for championship 12-round fights, though probably still fighting for minor titles.
But factors such as great natural talent, a strong amateur background and good promotional connections can all greatly shorten the climb to the top.
For this list, I am using debuts in November 2008 as the cut-off date for within the past five years.