CALGARY - It's a small sample size, but late-game sags have the Calgary Flames off to slow start to the NHL season.

The Flames (1-3-0) lost the third period in a third straight game in Tuesday's 4-2 defeat at the hands of the Vegas Golden Knights.

After a 4-3 shootout road win over the Edmonton Oilers to open the regular season, the Flames were outscored 9-1 and outshot 32-19 in third periods over their next three.

"That's something to be addressed for sure," Flames defenceman Mackenzie Weegar said. "I hate the word 'concerning', but it's definitely something to be addressed, and we've got to fix that for sure."

The St. Louis Blues struck twice in the third period of Calgary's home opener on Saturday to leave with a 4-2 win. The Vancouver Canucks outscored the Flames 4-1 in the third p

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