Golovkin (28-0, 25 KOs) constantly stalked the 28-year-old Stevens (25-4, 18 KOs) and floored the challenger with a ferocious left in the second.
According to HBO Boxing, the 5-foot-11 Golovkin ultimately landed 293 punches and the blows badly defaced the 5-foot-7 Stevens.
Although courageous and brimming with testicular fortitude, Stevens was utterly overwhelmed and the bout needed to be called.
"My plan was to just box,” said Golovkin, 31, who earned a silver medal as a middleweight at the 2004 Summer Olympics. “I know I am champion. I know I am better."
A ferocious and accurate slugger, Golovkin’s never once hit the canvas and has now recorded 15 consecutive knockouts.
Following the mismatch, “GGG” offered to throw fists with Sergio Martinez.
Regardless of who the menacing Russian scraps next, Gennady Golovkin is a “champion” and perhaps the most indomitable prizefighter today.