Colorado Avalanche goaltender Philipp Grubauer heads back to the net during a timeout in the first period of Game 1 of an NHL hockey Stanley Cup first-round playoff series against the St. Louis Blues, Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

Colorado Avalanche center Nathan MacKinnon, left, argues for a call with referee Francis Charron in the second period of Game 1 of an NHL hockey Stanley Cup first-round playoff series against the St. Louis Blues, Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

Colorado Avalanche left wing Gabriel Landeskog, left, fights with St. Louis Blues center Brayden Schenn in the first period of Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

Colorado Avalanche left wing Gabriel Landeskog, left, fights with St. Louis Blues center Brayden Schenn in the first period of Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

St. Louis Blues right wing Vladimir Tarasenko, front, drives to the net with the puck past Colorado Avalanche defenseman Devon Toews in the first period of Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

St. Louis Blues center Robert Thomas, right, reaches out for the puck as Colorado Avalanche defenseman Cale Makar pursues in the first period of Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

St. Louis Blues goaltender Jordan Binnington, right, makes a save against a shot by Colorado Avalanche left wing Andre Burakovsky (95) in the second period of Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

St. Louis Blues goaltender Jordan Binnington heads to the net during a timeout in the second period of Game 1 of an NHL hockey Stanley Cup first-round playoff series against the Colorado Avalanche, Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)

Colorado Avalanche center Nathan MacKinnon, right, checks St. Louis Blues left wing Jaden Schwartz in the corner in the first period of Game 1 of an NHL hockey Stanley Cup first-round playoff series Monday, May 17, 2021, in Denver. (AP Photo/David Zalubowski)