Ouch, Canada.

The World Series wasn’t supposed to start like this. The Dodgers weren’t supposed to begin their inevitable championship march like this.

Even playing in their raucous Rogers Centre north of the border in the opener Friday, the cute little Toronto Blue Jays were supposed to be a far inferior team, eh?

Uhhhh…

For baseball’s burgeoning dynasty, there suddenly looms disaster. For the dominating Dodgers, this is now a World Serious.

The Blue Jays didn’t just win Game 1, they hammered the Dodgers into a maple-leafy pulp, 11-4, battering their ace and bruising their ego and sending a message.

It was delivered in the ninth inning, when the fans rained a chant down on Shohei Ohtani, who spurned the Blue Jays in his free agent sweepstakes two years ago and whose two-run homer meant nothing Friday night.

“We don’t need you… we don’t need you.”

When the game ended shortly and mercifully thereafter, another unspoken message had been sent.

You know where you can stick your broom…

Truly, the only thing getting swept in this series is the Dodgers’ aura of invincibility, as the Blue Jays did exactly what they needed to do by hitting them precisely where it hurts.

Welcome to the postseason, Dodger bullpen.

Now get lost.

Wearing down ace Blake Snell for 29 pitches in the first inning and 100 pitches by the sixth, the pesky Blue Jays hitters loaded the bases with none out and the score tied 2-all when Snell left the game for the maligned and recently ignored Dodger relievers.

And all Hortons broke loose.

Emmet Sheehan lasted four hitters and allowed three baserunners. Ernie Clement singled in a run, Nathan Lukes walked to force in a run and Andrés Giménez singled in a run, and have you ever heard of any of those guys?

Enter Anthony Banda, and exit an Addison Barger fly ball into the right-field stands for the first pinch-hit grand slam in World Series history. Add an ensuing single by Vladimir Guerrero Jr. and a home run from Alejandro Kirk and you pretty much get the picture.

The Dodgers gave up nine runs in the sixth inning, more than twice as many runs as they gave up in the entire four-game National League Championship Series win against the Milwaukee Brewers.

Worse yet, they allowed, for the first time this postseason, some doubt.

Did the seven days off since the NLCS sweep ruin their timing as brief October vacations have done to Dodger teams in the past? After all, this is the fifth time in World Series history a team coming off a sweep played a team that was stretched to seven games, and in the previous four times, the team that was stretched won the series.

“You know, honestly, I really don’t think the week layoff had anything to do with tonight,” said Dodgers manager Dave Roberts. “We were rested. I thought we were in a good spot.”

They indeed led 2-0 early but wasted some baserunners and Ohtani left the bases loaded with a groundout in the second. Then Daulton Varsho stunned Snell with a two-run homer in the fourth to set up that sixth-inning nightmare.

The Dodgers had gone 9-1 in these playoffs mostly because their quality starting pitching had allowed them to usually avoid the bullpen except for closer Roki Sasaki. If Roberts has to keep opening that gate early, they’re in trouble.

“They need to bounce back,” Roberts said of his relievers. “With the construct of the pen, we’re going to need ‘em.”

The Dodgers will roll out another ace, Yoshinobu Yamamoto, in Game 2 Saturday. He pitched a complete game in his last start, so maybe there’s no cause to worry.

Or maybe the Blue Jays just gave them 11 good reasons to worry. This is an offense that works the count to two strikes and then rarely chases once they get there. This is an offense that can wear you down even if you are Blake Snell and coming off one of the best postseason pitching performances in history. This is an offense that patiently, painfully, stuck it to a Dodger strength.

“You got to give those guys credit,” said Roberts of the Blue Jays. “They certainly fought”

Before the game, this seemed like an unfair fight.

The Blue Jays were starting Trey Yesavage, a rookie pitcher who began the season in the Class-A Florida State League pitching for the Dunedin Blue Jays in front of 328 fans against the Jupiter Hammerheads. The 22-year-old was the second-youngest starting pitcher in World Series opener history. He had made just six total major-league starts, and just last week was shelled for five runs in four innings by the Seattle Mariners in the ALCS.

He shouldn’t have lasted two innings but he survived, squelching early Dodger offensives and holding them to those two early runs while completing four innings despite three walks and four hits.

The Jays were also starting Bo Bichette at second base even though he had not played the position in six years and never in the major league. The team’s standout shortstop had also not played anywhere in 47 days since he was sidelined with a sprained knee.

“Yeah, it’s crazy,” said Bichette.

You know what’s crazier? He singled, walked, turned a double play, and made a great stop-and-throw on a grounder before being removed for a pinch-runner in the sixth

The Blue Jays were also starting an outfield trio known only to family and close friends. Kudos to all those who had Myles Straw, Daulton Varsho and Davis Schneider on your bingo card.

Varsho homered. Enough said.

In all, the Blue Jays used 12 different position players who all refused to surrender at the plate, battling the Dodger pitchers into a puddle.

“Yeah, that’s kind of how we roll,” said manager John Schneider.

And if they’re not careful, that’s how the Dodgers are going to get rolled.

When Roberts was asked Friday afternoon about the pressure his team felt, he said, “None. None whatsoever.”

Check that.