Jon Jones (above), who defended his light heavyweight title in April, is the new face atop SI.com's MMA pound-for-pound chart. Scott Cunningham/Getty Images

It's tough to argue against Anderson Silva. The man has not lost a fight in over seven years, and in all the time since then he has decimated opponent after opponent with his lethal fluidity. He won the UFC middleweight championship way back in October 2006 and has successfully defended it a record nine times.

He also owns UFC bests in consecutive wins (14), longest title reign (six years and six months, and counting) and most gasps of disbelief from awestruck fans.It