Robertson had eight points in five preseason games but was assigned to Toronto of the American Hockey League before being recalled Sunday.
"It's been ups and down for sure (since getting sent down)," Robertson said. "To get sent down given cap space and everything, the situation was tough to grasp. That was tough. But now to get a night like this kind of makes up for it. But I don't just want to have a night, I want to be consistent, play well and help the team."
Maple Leafs coach Sheldon Keefe said he had no reservations about using Robertson in overtime.
"He was feeling it," Keefe said. "I had to talk myself out of putting him out earlier (in overtime). I thought he had a good game. A lot of open ice out there, I thought he could make a play and he did. A great finish by him but I loved how the play developed. You had the Rocket Richard Trophy winner coming down the pipe and he makes the right play, gets all the attention of the goalie and puts it over for Nick to finish."
Seguin tied it 2-2 at 7:21 on the power play. The goal was initially waved off due to illegal contact of the goalie. The Stars challenged, and the goal was allowed upon review after it was determined Maple Leafs forward Mitchell Marner initiated the contact.
"I figured it wouldn't count because they said no goal on the ice and then took that long," Seguin said. "I was saying it probably wasn't going to happen, but I didn't think I did anything wrong and I'm one of those guys who always thinks you're innocent."