Brink said he's done his best to stay positive during his early struggles.
"It's not every day you get to score in this league, so it feels pretty good when you do," he said. "... There's ups and downs throughout the year. Right now it's an up, and couple days, a week ago, it was a down. So it happens, and just kind of got to stay in the middle."
The play that led to go-ahead goal started when Blues forward Jordan Kyrou turned the puck over at center ice.
"I had the puck and I tried to skate with it a little bit laterally and it hopped on me and I should have just been more direct there," he said.
Ersson made the lead hold up, including a sliding pad save on Blues forward Brayden Schenn with 24 seconds remaining and Binnington on the bench for an extra attacker. Philadelphia also had two of its 24 blocked shots in the final minute, by defenseman Rasmus Ristolainen and forward Noah Cates.
"I think we have a very good level where they're blocking the right shots too," Ersson said. "They're not trying to get in front of everything. They're knowing kind of what shots they can leave to me, and I think that's huge. It builds chemistry between me and the guys in front of me."
Ersson stopped all 14 shots he faced through two periods, building off the 25 saves he had against the Bruins on Tuesday.
"Obviously it's nice whenever 'Ers' is standing on his head for us," said defenseman Nick Seeler, who led the Flyers with six blocked shots. "... His preparation, and the way he goes about his business, you know he's going to show up for every game, and he's going to make some huge saves for us and keep us in every game. That's a goalie you want to play in front of."
Hathaway made it 1-0 at 11:12 of the first period when he scored from the slot to finish an end-to-end rush by Ryan Poehling. The goal was Hathaway's first in 29 games, dating to March 7 of last season.