Ersson made a glove save on defenseman Adam Fox 37 seconds into the game. He also made several stops late in the third period and in overtime with the Rangers on the power play.
"That save that he made on Fox in the first four minutes and the penalty kill in overtime -- he was amazing," Zegras said. "... When that first one goes in it's like, he made so many ridiculous saves after that, like it didn't even matter."
Sam Carrick and Alexis Lafreniere scored for the Rangers (22-29-7), who have lost five straight. Shesterkin, who was playing his first game since Jan. 5 because of a lower-body injury, made 21 saves.
It was the first game for the Rangers since forwards Vincent Trocheck and J.T. Miller, and coach Mike Sullivan helped Team USA win gold at the Olympic Winter Games Milano Cortina 2026.
"I thought 5-on-5, we were pretty good. We had a great start to the game," Sullivan said. "The power play didn't execute, we made poor decisions, and our penalty kill needs to be better."
Carrick gave the Rangers a 1-0 lead at 9:56 of the first period when he threw a shot at the net from the right boards.
"It's a big two points for us," Flyers coach Rick Tocchet said. "Obviously a tough first goal for Ersson, but he battled. There were a lot of good things. We could have melted after those first 10 minutes."
Lafreniere made it 2-0 at 1:23 of the second period, scoring in front off a no-look pass from Will Cuylle. Lafreniere began the play by getting the puck behind the net and passing to Vincent Trocheck, who found Cuylle before he fed it to Lafreniere.
Michkov cut the deficit to 2-1 at 10:25 with a power-play goal from in front on a one-timer off a saucer pass from Cates.