Is there anyone? Didn't think so.
Also, how about asking that question the other way around, is there anyone on Joe's record that Bernard wouldn't beat? Maybe... a prime Robin Reid would have been a good fight, I imagine Sakio Bika's unorthodox style and raw power would give an oldman Hopkins plenty of trouble, and also I think Mikkel Kessler would KO Hopkins. I don't think Hopkins has the power to keep Jeff Lacy off him like Joe did either.
Thoughts?