Since then, they've faced one another three times in the last six postseasons, each time in the Quarterfinals round. The clubs are set to begin their fourth playoff match in seven years Tuesday night in Pittsburgh.
Via the Penguins, here is the schedule for their second-round match.
GAME 1: Tuesday, May 14 | 7:30 PM | NBCSN | CONSOL Energy Center
GAME 2: Friday, May 17 | 7:30 PM | NBCSN | CONSOL Energy Center
GAME 3: Sunday, May 19 | 7:30 PM | NBCSN | Scotiabank Place
GAME 4: Wednesday, May 22 | 7:30 PM | NBCSN | Scotiabank Place
GAME 5*: Friday, May 24 | 7:30 PM | NBCSN | CONSOL Energy Center
GAME 6*: Sunday, May 26 | Scotiabank Place | Time, Network TBA
GAME 7*: Tuesday, May 28 | CONSOL Energy Center | Time, Network TBA
From the second round forward, all games will appear locally on national networks. NBC Sports has been tagged for the first five contests. Games 6 and 7, while unannounced, could be broadcast on NBC.
Pittsburgh is 2-1 all-time in series against the Senators, and won their last meeting in six games in the 2010 Quarterfinals.