Seguin, who centered the first line for Robertson and Joe Pavelski with Roope Hintz missing his sixth straight game because of an upper-body injury, has eight points (five goals, three assists) in that span.
"I know I'm just keeping Roope's seat warm, but they're great players and I'm able to find open spaces out there," Seguin said. "I'm not going to play with those guys forever, so this game is about opportunities and just trying to make the most of it and not mess up their chemistry too much."
Robertson made it 4-0 at 7:27 of the second. His initial wraparound attempt was stopped by Copley, but Robertson scored on the rebound.
Seguin had the primary assist for his second game with three points this season. He had three assists in the season opener against the Nashville Predators on Oct. 13.
Robertson credited Seguin with providing energy to the line. Seguin, Robertson and Pavelski were each plus-3.
"He's enjoying it," Robertson said. "I'm enjoying playing with him, and I'm sure 'Pav' is too, and yeah, we all like that little extra jump he's got right now."