Five minutes into the third, the Senators went on the power play when Dmitry Kulikov was called for interference and matching two minute roughing minors on Chris Phillips and Krys Barch.
The Senators took the lead just 30 seconds into the man advantage when 39-year old winger Daniel Alfredsson caught goaltender Scott Clemmensen out of position and scored his 10th goal of the season. Chris Neil was awarded an assist on the play.
Erik Condra was called for hooking at the eight minute mark and the Cats were able to even the score up again, this time on a power play goal by Shawn Matthias, his sixth goal of the season. Brian Campbell and Mike Santorelli got the helpers.
Erik Karlsson scored his fourth goal of the season just 38 seconds later with assists by Daniel Alfredsson and Colin Greening through heavy traffic.
Florida pulled the goalie with just over a minute remaining for the extra skater. Just a few seconds later, Tomas Kopecky scored his fifth goal of the season with assists from Kris Versteeg and Matt Bradley.
The teams go to the extra frame to decide it, tied 3-3.