In the second period, the Penguins used a Washington turnover to generate a scoring chance: Jake Guentzel made a timely pass to teammate Bryan Rust, who scored to put the visitors on the board. This proved to be the only goal of the period, as the Penguins went into the second intermission up 1–0. Then, in the third period, Patric Hornqvist wristed a shot over Holtby's shoulder to add insurance to Pittsburgh's lead. The Penguins did not relinquish their 2–0 lead, as they shut out their arch-rivals in Washington to advance to the Eastern Conference Finals for the second consecutive year. Fleury made 29 saves for Pittsburgh in the deciding win.
 The series shifted back to the Verizon Center for Game 5. With Sidney Crosby back in the lineup and the Penguins up 2–1 after two periods, they had a chance to close out the series and earn a trip back to the Eastern Conference Finals, but it all went downhill for them starting from the puck drop for the third period. Nicklas Backstrom, Evgeny Kuznetsov, and Alexander Ovechkin scored to help the Capitals bounce back to win Game 5, 4–2, and send the series back to Western Pennsylvania for Game 6.  Washington rode their momentum generated in Game 5 into Game 6, as they tallied the first five goals of the game.
In referee Dan O'Rourke's eyes, the puck had crossed the line, so he signaled a goal the play then was under review, and after a closer look, the puck had gone over the line by the length of a stick blade,  and the referees awarded the goal to the Capitals giving Oshie the hat-trick and Washington a 1–0 series lead.
John Carlson, T. Oshie, and Nicklas Backstrom scored once each for the Capitals, while André Burakovsky scored two. With Washington leading 5–0 with minutes left, Pittsburgh scored two goals, yet the Capitals still won 5–2. Braden Holtby made 16 saves on 18 shots to send the series to a decisive Game 7 on Washington ice.  For the fourth time in history, the Washington Capitals and Pittsburgh Penguins played a Game 7 against each other. The first period did not have any goals scored: Marc-Andre Fleury and his counterpart, Holtby, were having a solid game thus far.
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This time, the Capitals took a 3–1 series lead by winning Games 1 and 2 on their home ice and then followed a Game 3 loss with a 7–2 drubbing of the Penguins in Pittsburgh. Dino Ciccarelli scored four goals in that game and was one of five Washington players to have a multi-point game that night. The Penguins would not give up, responding with a 5–2 win in Game 5 in Landover. Pittsburgh then won both Games 6 and 7 by two goals each to win the series in seven games. After this series, the Penguins would defeat the New York Rangers in the Division Finals and win eleven consecutive games to their second Stanley Cup.
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The game went down to the wire, as the score remained 3–2 with just over a minute to play. In the final minutes, Oshie was called for high-sticking Nick Bonino,  however, replays showed that Oshie's stick never even touched Bonino's face; regardless, Bonino did not receive an embellishment call.  The Penguins held on to win Game 4, 3–2, to take a 3–1 series lead heading into D. for Game 5.
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They did, however, jump out to a 2–0 lead after goals from Patric Hornqvist in the first period and Jake Guentzel in the second period. The Capitals roared back with two second period goals of their own, scored 1:12 apart from Kuznetsov and defenseman Nate Schmidt. Later in the period, John Carlson was called for roughing, putting the Penguins on the power play. Pittsburgh capitalized on the man advantage, with Justin Schultz getting the power play goal.
Carl Hagelin added to the Penguins' lead with a goal in the second period for a 3–0 lead. Washington would try to comeback as Alexander Ovechkin and Justin Williams scored in the third period for the Capitals to cut Pittsburgh's lead to 3–2. That would turn out to be the final score of the game, giving the Penguins a 2–1 series lead.  Pittsburgh's Kris Letang, however, was suspended for the next game for leaving his feet just before hitting Marcus Johansson. He was originally whistled for interference, and then was suspended one game by the NHL's Department of Player Safety for making Johansson's head the main point of contact.  Game 4 began with a backhanded shot by centre Jay Beagle that went over Matt Murray's shoulder to give the Capitals a 1–0 lead three minutes into the game.
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Before the 1998–99 season, the NHL realigned its divisions once more. However, the Capitals and Penguins remained interdivisional opponents, as the Penguins were placed in the new Atlantic Division and the Capitals were placed in the new Southeast Division. The two rivals did not meet in the playoffs again until 2000.
Ovechkin responded with his ninth goal of the playoffs to tie the score at one; he followed that with assisting on Backstrom's power play goal to put Washington ahead, 2–1. Fedotenko and Matt Cooke both scored to put Pittsburgh ahead 3–2 in the third period, but then Ovechkin, with 4:08 remaining in regulation, tied the score at three with his second goal of the game and tenth goal of the playoffs (Backstrom assisted on his goal for his second point of the game). In overtime, Washington defenseman Milan Jurcina tripped Evgeni Malkin and got a penalty for it.
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