Josh Taylor needed just 161 seconds to send Apinun Khongsong packing in a lightning-quick defence of his WBA and IBF light-welterweight titles.
The Scot floored Khongsong with a sickening left hook to the body in the first round and he didn't beat the count.
In fact, the Thai challenger remained on the canvas for more than five minutes as he received treatment clearly in agony from the body shot.
The punch snuck under Khongsong's rib cage and he sunk to the floor at the supporter-less York Hall with 19 seconds left of the opening round.
The start of the fight had seen a cautious approach from Taylor in his first fight for 11 months.
Taylor added the WBA belt to his IBF crown with a thrilling points win over Regis Prograis in the World Boxing Super Series last October.
The Tartan Tornado was soon in and out like a whirlwind.
Taylor, 29, was happy to sit behind the southpaw jab as he worked out Khongsong who was looking for a big right hand on the counter.
Josh Taylor on road to hero status going from fishing village to eyeing up Manny Pacquiao
But the first time Taylor got inside he floored him with a left hook.
Referee Phil Edwards counted him out before the medics came in to assist the stricken Thai.
Khongsong got to his feet but was clearly still in agony and he left the venue on a stretcher soon after, heading for hospital.
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It was an easy night's work for Taylor who had barely broken a sweat but proved yet again his ability.
The Scot is now aiming for an undisputed clash with Jose Ramirez early next year.
WBC and WBO champion Ramirez does have the problem of a mandatory defence against Jack Catterall though which may scupper the bout for all four belts.
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