KSI knocked out rapper Swarmz in devastating fashion in round two at the O2 Arena.
The YouTuber-turned boxer is breaking new ground by fighting twice in the same night and kicked off the show with an emphatic stoppage in London.
KSI, having been out of the ring for three years, came out of the blocks in rapid fashion and was firing all sorts of combinations to his opponent, who he collaborated with on the track 'Houdini' - which debuted at number six on the UK singles charts in 2020.
Swarmz, who took the fight on short notice and had never boxed before, somehow survived the first round despite being knocked down and spending most of his time running and spinning around.
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However that all changed as early on in the second, KSI caught the former footballer with a wicked left hook that put him on the canvas.
The referee waved off the contest, continuing the Sidemen member's undefeated record.
KSI will now sit back and watch the next batch of fights on the Misfits boxing card, including his brother Deji, before he steps into the ring for a second time this evening.
The 29-year-old, now 2-0, takes on professional boxer Luis Alcaraz Pinada in the main event. Pinada, hailing from Mexico has a 2-5 record and has lost his last four bouts inside the squared circle.
Josh Lawless