Damian Knyba Stops Marcin Siwy in Eight

Newark, NJ - Polish heavyweight Damian Knyba made a powerful statement on Saturday night, dominating countryman Marcin Siwyover eight one-sided rounds before forcing a corner stoppage at the Prudential Center in Newark, New Jersey.

The bout, billed as a meeting of undefeated Polish heavyweights, quickly took on the shape of a showcase. Knyba controlled the distance from the start, using his superior height and reach to hammer Siwy with stiff jabs, looping right hands, and body shots that drained the older fighter’s stamina as the rounds progressed.

By the halfway point, Knyba had established total control. Siwy’s face began to swell and a cut was open over his left eye, while his punch output dropped significantly. Knyba, calm and measured, increased the tempo in the later rounds, landing clean, unanswered combinations that forced Siwy’s corner to pull their fighter out at the end of the eighth.

A Tale of Two Records

Both men entered the ring unbeaten, but the matchup was widely considered a step-up test for Knyba and a crossroads moment for Siwy.

Knyba, now 16-0 with 10 knockouts, had faced modest competition before Saturday’s co-main event. Siwy, though 25-0-1 entering the bout, had not fought at Knyba’s level or against comparable opposition. The difference in pedigree showed from the opening bell.

Post-Fight Reaction

Knyba, who fights out of New Jersey under the Top Rank banner, continues to rise in the crowded heavyweight scene. With Saturday’s performance, he affirmed his place as one of Poland’s top active boxers and a legitimate prospect for international attention.

“I wanted to show that I can go rounds and still dominate,” Knyba said post-fight. “This was a Polish battle, but I knew I had to take control early and stay smart. Now I’m ready for the next step.”

Siwy suffered his first professional defeat, falling to 25-1-1. While he showed heart, his inability to close the distance or handle Knyba’s physicality was decisive.

What’s Next for Knyba?

Saturday’s win likely sets Knyba up for a bigger stage appearance—possibly on a major undercard or in a regional title bout. With ESPN+ and Top Rank’s support, a U.S.-UK cross-promotional push could be on the horizon.

While Siwy may look to rebuild, it’s clear that Knyba is the one moving forward—faster, sharper, and ready for the names ahead.