Who has the best left hook in the business?

[goblin213]

Donaire. He can KO dudes with that punch even when he is moving backward.

[KILLA RIGHT]

Gotta go with paulie.........na jk probably Cotto floyd or nonito..

[AdamantiumPI]

Cotto (left hook to the head or the body in terms of raw power) or Donaire (Power, timing and accuracy). Floyd has good timing and accuracy but his left hook isn't as devastating it was when he was a lightweight.