DETROIT - With fresh legs, the Detroit Red Wings threw everything they had at the weary Calgary Flames in the first period.

They attacked on offense, and swarmed on defense.

Two-plus periods later, they lost.

Marcus Nilson's first career playoff goal at 2:39 of overtime lifted Calgary to a 2-1 victory over the Red Wings Thursday night in Game 1 of their Western Conference semifinal series.

The Flames, playing their third straight overtime game after a long flight and just two days off, beat Vancouver in overtime in Game 7 of their first-round series after losing Game 6 in triple-overtime.

"We knew we were going to have to weather the storm early, and that's what we did," Flames coach Darryl Sutter said.

Detroit played its first overtime of the postseason after it got past Nashville in six games and had four days of rest. The Red Wings have lost seven straight overtime playoff games at home and 10 of 12 overall, dating to 2000.

At Philadelphia, Marcus Ragnarsson scored the go-ahead goal in the second period.

At San Jose, Calif., Patrick Marleau had his second three-goal game of the postseason, and the Sharks scored three first-period goals.