Lapierre made it 2-0 at 9:59 of the second period. Malkin carried the puck from the opposite end on a 3-on-2 rush before moving it to Ville Koivunen, who set up Lapierre for a backhand-to-forehand wrist shot just outside the crease.
The Panthers did not have a shot on goal during a four-minute power play after Silovs was given a double minor for high-sticking Sam Bennett at 16:17.
"We're not playing good at all," Florida forward Matthew Tkachuk said. "It's very frustrating to have a back to back, quick turnaround like this and lay an egg like we did tonight. ... This stuff just can't happen. It's not even how we're losing, it's the way we're playing. It's something that we're going to have to fix in here."
Malkin extended it to 3-0 at 1:40 of the third period, sliding the puck under a diving Gustav Forsling and regaining it for a wrist shot under Black's glove.
"I think (you) just learn from the mistakes, right?" Black said. "You go out there and you see the patience that those guys have on their stick. I think two of their goals, they kind of just waited me out, maybe, a little bit."
Robertson scored an empty-net goal at 17:34 for the 4-0 final, tying Malkin for the team lead with six goals.
"I just think all three periods were consistent," Robertson said. "We didn't let off the gas. Obviously, going into the third with the lead, we wanted to finish it off, and we did."
NOTES: Before Black, Ben Bishop, Mikko Koskinen, Ivan Fedotov and Mads Sogaard were the tallest goalies in NHL history at 6-foot-7 each. Black tied skaters Zdeno Chara, Curtis Douglas and Matt Rempe as the tallest players in NHL history. ... Penguins forward Ben Kindel did not play after briefly losing consciousness while aboard the team plane on Tuesday due to a vasovagal syncope, a sudden drop in heart rate and blood pressure that reduces blood flow to the brain. He was placed on injured reserve Thursday but could practice as early as next week after further testing, Pittsburgh general manager Kyle Dubas said. ... Pittsburgh forward Egor Chinakhov was a late scratch with a lower-body injury. He is day to day. ... Forsling left after taking a puck to the face late in the third period and did not return. No update was provided.