Michalek was the main piece coming back to Ottawa during the summer when the club traded Dany Heatley to the San Jose Sharks, and in 66 games recorded 22 goals to go with 12 assists.
Ottawa already lost its fourth-leading scorer, Alexei Kovalev, also to a torn ACL, before the playoffs even started. They didn't miss either of them on Wednesday as they stunned the defending champs in their own barn with solid puck possession (out-shooting the Penguins 26-21), strong even-strength defense (two of the Penguins' goals came on the power play, while the Senators at one point limited Pittsburgh to just one shot on goal over a 20-minute period) and a dominant night in the face-off circle (winning 59 percent).
Obviously, with Michalek and Kovalev done for the playoffs, the Senators are going to need more efforts like that from their depth players and continue to outwork the Penguins, much like they did in Game 1.
Ryan Shannon (five goals, 11 assists in 66 games) will likely take Michalek's spot in the lineup.