Although the Penguins got admirable efforts from injury replacements Carter Rowney and Dominik Simon, it was their top line that led the way. Guentzel (one goal, two assists), Crosby (one goal, one assist) and Hornqvist (one goal, one assist) combined for seven points.
Guentzel had four goals and one assist in Pittsburgh's 8-5 series-clinching win against the Philadelphia Flyers in Game 6 of the first round. The 23-year-old's 16 points (seven goals, nine assists) tied Crosby, who had 16 in 2010, for the second most in the first seven games of a playoff year in Penguins history, behind Mario Lemieux's 17 in 1992.
Crosby is one point behind with 15 (seven goals, eight assists) and Hornqvist has eight (three goals, five assists) despite missing two games with an upper-body injury.
"I just think we complement each other well," Guentzel said. "We get on the forecheck and we're always around each other. Playing with Sid, it makes it pretty easy and opens up a lot of space for us."
Guentzel, Crosby and Hornqvist were on the ice for both Capitals' goals. The first came on an Evgeny Kuznetsov breakaway 17 seconds into the first period.
After Ovechkin beat Murray over the glove from the left circle to make it 2-0, Guentzel, Crosby and Hornqvist elevated their game and scored on each of their next three shifts.