"The man couldn't see the punches," Briscoe said of his fighter. "I stopped the fight to save him from himself."
After a slow first round, Golovkin (25-0) pressed more in the second round and opened a cut above Rosado's left eye with a straight left that snuck through Rosado's gloves. But in the final 10 seconds
Rosado (21-6) answered back, meeting a charging Golovkin with a right.
Rosado's cut worsened in the third as Golovkin continued to target the left side of Rosado's face. With a bloodied face in the fourth round, Rosado could only defend so much of Golovkin's offerings.
Golovkin caught Rosado with a swift right at the 50-second mark and controlled much of the round.
In the fifth round, Rosado battled back and connected with a strong uppercut that created a large welt under Golovkin's left eye. By the end of the round, Rosado appeared confident as he jostled between punches. But Golovkin staggered him with a hook midway through the next round to stop his momentum.
For the second time in the fight, a doctor was called to Rosado's corner to examine the fighter's left eye. The blood had covered half of his face and stained his torso.
"I couldn't see the shots. The blood was going into my eye," Rosado said afterward.
The fight was only Golovkin's third against a U.S. opponent and second to take place in this country.
"Gabriel is a strong man. He was a great opponent," the champ said.
Contact Matt Breen at firstname.lastname@example.org or @matt_breen on Twitter.