Answer
The Chicago Blackhawks were the team that Giroux's playoff performance was especially memorable against in 2011. Giroux, who was then a member of the Philadelphia Flyers, had a standout performance in the series, scoring two goals and adding four assists in the six-game series. The Flyers ultimately lost the series, but Giroux's performance left a lasting impression on fans and solidified his status as one of the league's top players.