12. Manny Pacquiao
Bonafides From 2002-2012: WBO Welterweight Champion, Former IBF Super Bantamweight and WBC International Super Featherweight, Lightweight, and Welterweight Champion, 21-1-1 (13 KOs)
Here's a little stat for y'all, since Complex released its first issue in April of 2002, Manny Pacquiao has gone 21-1-1 with 13 KOs in the ring. Not bad, huh? In fact, HBO named Pacquiao the "Boxer of the Decade." That's a pretty impressive run, if you ask us. After all, we may know a thing or two about being at the top of your game for an entire decade. Sidebar: Can we not wait another ten years for Mayweather/Pacquaio?