Carle received a new defense partner when the Flyers traded for Chris Pronger at the 2009 NHL Entry Draft. The duo immediately established chemistry whilst in training camp and started production early in the season. The Flyers' home opener in the 2009–10 season saw Carle tie the NHL record for assists in a single period by a defenseman with four, all coming in the second period against the Washington Capitals; the amount was also a career-high for Carle. In the game, Carle's passing also helped captain Mike Richards score his second career NHL hat-trick.