Reinhart gave the Panthers a 1-0 lead at 3:33 of the first period with his 11th goal of the season, and Tkachuk made it 2-0 at 5:14.
Evan Rodrigues extended it to 3-0 at 1:56 of the second period, scoring for the third straight game with a wrist shot from the right circle.
Verhaeghe pushed it to 4-0 at 11:18 with a power-play goal, backhanding a shot off a point shot from Uvis Balinskis.
“Getting the lead was huge, carrying it over and extending it was huge for us,’’ Verhaeghe said. “I thought we played a solid game. It was a little low energy, but we battled and played well.’’
Stamkos cut it to 4-1 at 13:52 with a one-timer on the power play off a pass from Roman Josi, but Verhaeghe made it 5-1 at 19:32, scoring on a cross-ice pass from Barkov.
“It was not just one of those nights. They were better than us from start to finish,” Josi said. “They kind of embarrassed us out there. They were faster, they were quicker, and they made better plays. They won battles. In every aspect of the game, we have to play better -- and that starts with me. We have to play a lot better as a team.”