Fortunes can rise and fall quickly in boxing. Fighting only a few times a year, a boxer has limited opportunities to make a big impression or overcome a setback.
To simply keep winning at the world-class level is a major challenge. To win with style or in an overwhelming manner is rare indeed.
So, it's no surprise that getting to the top in the fight-game can take years of hard work and patience. But, the fighters on this list made huge strides in 2013 and will enter next year in position to land some of the biggest fights in the sport.