Michalek, acquired at the start of training camp from San Jose in the Dany Heatley trade, shoveled a rebound past Mike Smith with Tampa Bay on the power play in the first period. The big Czech winger beat Smith again on a breakaway early in the second, helping the Senators to their fourth win in the past five games.
Michalek completed the hat trick when he converted a spinning pass from Jason Spezza during a third-period power play.
Jarkko Ruutu had a goal and two assists and Alex Kovalev, Alexandre Picard and Nick Foligno also scored for the Senators. Daniel Alfredsson had three assists.
Pascal Leclaire enjoyed a quiet night in goal, needing to make just 16 saves.
Ryan Malone scored for the Lightning, his sixth goal of the season.
Smith finished with 28 saves.
Notes
Martin St. Louis had an assist for Tampa Bay. He has at least a point in every game this season. … The Senators will be Montreal on Saturday night. It'll be Kovalev's first game there since signing with Ottawa in the offseason.