The 33 year-old made it three victories on the spin since losing out to featherweight Nicholas Walters in Carson as Donaire fought fire with fire and came out the other side with the WBO super bantamweight belt.
Donaire had the considerably more vicious arsenal to call upon and had Juarez on the canvas twice in the fourth round before seeing out a 117-109, 116-110 twice win with the three ringside judges.
‘The Filpino Flash’ improves to 36-3 in claiming his latest strap and could meet the winner of February’s unification battle between Carl Frampton and Scott Quigg for a trio of championships next summer.
In the co-feature, the highly-talented Felix Verdejo continued his path towards an inevitable world title win by stopping the experienced Josenilson Dos Santos in just two rounds.
The 22 year-old lightweight made it 14 knockouts from 19 victories to retain his WBO Latino belt and push on towards a possible shot at Terry Flanagan should the Briton come through compatriot Derry Mathews in the New Year.