Former Ottawa Senator Mark Kastelic reminded fans Saturday night why he’s a player most NHLers aren’t looking forward to going up against. Now with the Boston Bruins, Kastelic battled Saturday night with Detroit Red Wings star defenseman Moritz Seider and the results were predictable.
This was only Seider’s second NHL fight, and it represented a huge jump in skill and weight class from his first career fight. According to HockeyFights.com, this one was against Nashville Predators star forward Filip Forsberg two years ago.
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The incident occurred in the final seconds of the first period. Kastelic collided with Seider in the Detroit corner. The two started with yelling and shoving, but things quickly escalated from there.
Moritz Seider vs. Mark Kastelic November 29, 2025
It was a bit surprising to see the Wings’ prized defenseman being allowed to freely confront one of the toughest men in the league without any interference from his teammates.
Kastelic, a veteran of 38 professional fights, stands 6’4″ and weighs 234 pounds. Seider, while physically imposing at 6’2″ and 210 pounds, is the smaller man and certainly not known for dropping the gloves. The lag appeared almost immediately. Kastelic landed several powerful right-hand haymakers, leaving Seider on the defensive and ultimately overwhelmed.
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Seider is a summer training partner and close friend of Senators star Tim Stützle. Kastelic was drafted by the Senators 125th overall in the 2019 NHL Entry Draft. He spent four seasons in the Senators organization, including two in Ottawa. He was traded two summers ago as part of the deal that saw Linus Ullmark traded from Boston to Ottawa.
This article was originally published in The Hockey News Ottawa. Learn more:
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