The only problem was the Maple Leafs forward's mother was in the bathroom and missed the whole thing.
After Marner, the fourth pick of the 2015 NHL Draft, scored at 11:56 of the first period, TV cameras focused on his parents' seats, but only his dad was there.
"I was washing my hands and I heard all the celebration and then I heard '16' and then I go, 'Oh my gosh, that's Mitch!'," Bonnie Marner told Sportsnet during the game. "So I ran over to that entrance and I'm like, 'Who got the goal?' and they go 'Marner,' and I go 'I'm his mom!' and they go, 'No you're not,' and I go, 'I AM!' and I showed them my phone and I celebrated down there with them."
After the game, Mitchell saw the clip of his mom going back to her seat.
"That's awesome," he told Sportsnet. "That's going to be something I can definitely talk to my mom about and give it to her, but it's exciting times, that's for sure."
His parents had a good laugh about the whole thing, and with Marner's reputation as a goal-scorer, Bonnie should be able to see another score soon.