3:45 AM ET

Associated Press

DENVER — Kirk Cousins was perfect in his cameo, and then kicked back and watched two former Broncos quarterbacks tear apart their old teammates.

Cousins completed all four of his passes in the Vikings’ 42-28 exhibition victory Saturday night, including a 1-yard touchdown strike on a quick slant to Stefon Diggs .

“I think it was a smooth first drive but it is a small sample size and the next couple of weeks will be a good test for us,” Cousins said.

Diggs called it a good first step.

“He’s a good quarterback,” Diggs said. “He makes some great throws.”

Case Keenum wasn’t nearly as sharp in his Denver debut, completing just 1 of 4 passes for 5 yards spanning two drives.

“It’s just frustrating not playing well and you don’t have a chance to bounce back from it,” Keenum said.

Cousins was the crown jewel of this year’s free-agent class of quarterbacks, signing an $84 million, three-year deal in Minneapolis. That meant Keenum was out two months after leading the Vikings to the NFC championship, and he signed a $36 million, two-year deal with Denver.

The Broncos then traded their starter,

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