The pair conflicted at a rambunctious O2 Arena in London on Saturday night, with the challenger the overwhelming most loved to develop as the victor.
Be that as it may, Martin landed in sure disposition and talked a decent diversion about how he had no goal of relinquishing the belt that he won as of late as January.
In any case, all that certainty appeared to betray him as the chime rang, as the champion neglected to enroll a solitary shot in displeasure against his adversary.
Thusly, it permitted Joshua to subside into a cadence and discover his extent, and a cagey opening round saw the pair trade punches as they kept on understanding each other before going out on a limb.
By the by, it was Joshua who was releasing his right hand, and he figured out how to puncture through Martin's gatekeeper in the second to send the American to the canvas.
Amazingly, Martin accumulated himself before getting to his feet, yet it wasn't much sooner than he was on his back again with another shivering right hand from Joshua discovering its objective.
In spite of the fact that Martin climbed to his feet once more, he seemed flimsy and unwilling to proceed as the arbitrator excludeed him which thus started wild scenes of festivities around Joshua.
The 26-year-old will now plan to set up real battles in the heavyweight division this mid year onwards, with promoter Eddie Hearn implying that they would go again on July 9, that night that Tyson Fury and Wladimir Klitschko conflict in a rematch in Manchester.
Things being what they are, what did we learn? In truth, Martin talked a decent diversion and guaranteed that he would thump Joshua out, yet whether it was the greatness of the occasion, the air or something else, he couldn't give an especially incredible record of himself.
While that may well be down to demonstrating Joshua a lot of appreciation, he didn't turn out to be an extraordinary champion. Regardless of whether he returns again stays to be seen, yet he'll be frustrated that he couldn't accomplish more to cling to his belt.
Concerning Joshua, his rate, exactness and force with his right hand had the effect, with Martin surrendering after the battle that he couldn't see it coming.
Harder tests lie ahead for the Olympic gold medallist and now best on the planet, yet there is no denying that he keeps on conveying in earnest style with 16 KOs in 16 wins. He surely keeps on illuminating what is presently an energizing heavyweight division, and he'll be going for alternate titles within the near future.