I've been a tad harsh in the past on Kostya Tsyzu but he didn't fight a single opponent that was a 'bum'
In 18 fights he'd already fought 32-0-0 Bergman, 21-1 Corey Johnson, 27-0 Pineda, Roger Mayweather, Pedro Sanchez, Angel Hernandez & Livingstone Bramble.
With only half a dozen fights he was fighting 16-0, 16-1 prospects.
Too his credit there isn't a single 'bum' on his resume, he fought maybe 3 journeyman all of which had a fairly respectable record.
I take my hat off to him.