Josh Taylor needed less than three minutes to stop Apinun Khongsong and retain his world titles.
The Scot was fighting for the first time since he unified the super-lightweight division with victory over Regis Prograis last October.
But having teamed up with new trainer Ben Davison, Taylor will have learned little from this run-out.
The champion landed a left hand to the body inside the final minute of the first round which left Khongsong writhing on the ground.
The Thai fighter, who was previously unbeaten but also untested, was still on the canvas several minutes later before he was helped to his feet.
But he was still suffering from his injury and was eventually taken away on a stretcher.
The victor said: "That sank right in, I felt it sink in straight away.
"I knew from watching videos he swings on the break and I saw it coming so I pressed in against him, pushed him against the ropes and I hit him with the left.
"I didn't know it hurt him to thaty extend until I turned round and saw him on the floor.
"That's the heaviest puncher I've been in with; he was very heavy-handed. He came out straight away with his jab and he was strong."
Taylor will now hope to move on to a fight with fellow champion Jose Ramirez which would be for all four belts in the 140lb division.
"I want Ramirez next," he added. "He's a very good champion; he's like myself, hungry and at the top of his game.
"I want that fight now; I believe I have the beating of him and I don't see anything in him that I haven't seen before.
"For personal and selfish reasons I want that fight and I think I deserve it."
In Germany, Mairis Briedis outpointed Yuniel Dorticos to be crowned the winner of the World Boxing Super Series and the IBF cruiserweight world champion.
The much-delayed final of the competition delivered with an intriguing clash with two of the three judges giving Briedis the nod with the other scoring the bout a draw.
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