The 2016 Rio silver medallist landed a solid jab in the opening seconds before rocking his opponent with a right-hand to the body.
Bursting with confidence, the 6ft 6in Londoner unleashed a flurry of punches forcing Palmer onto the back foot.
Joyce finished the Boston-based boxer in style with a sharp two-punch combination, leaving Palmer in a heap in the centre of the ring. Palmer looked unsteady as he got to his feet, leaving referee Jeff Hinds no choice but to bring the contest to a halt.
