Floyd Mayweather leads the way in a weight division that is quickly becoming the most interesting in boxing through several developments.
The junior middleweight division (154 lbs) is where Sergio Martinez made his first big splash, Shane Mosley made his last stand and Mayweather fought his most competitive fight in nearly a decade.
Now there's fighters moving up weight classes to be there. There's champions from higher weights talking of dropping pounds to get there. There's former knockout kings making a comeback.
Then there's the superstars in the making already making headlines as champions and contenders.
With all this electricity sparking from every direction, this could easily become a classic era in this weight division. Here are the biggest power moves and figures to look out for as the division continues to heat up.