Jorge Polanco shooting the game and ALDS-winning base hit for the Mariners in the bottom of the fifteenth . . .

“Life is what happens when you’re busy making other plans,” sang John Lennon on the last album he released in his lifetime. Instead of singing it in the middle of a sweet lullaby he wrote for his then five-year-old son, the former Beatle could have been singing about baseball.

He could have been singing, too, about such contests as the just-concluded American League division series between the Tigers and the Mariners. The one that came to a fifth game that came down to a fifteenth inning and, possibly, both teams wondering just whom was going to commit a fatal flub, flop, or faux pas, Phillies-like or otherwise.

“It felt the whole game,” said Tigers shortstop Javier Baez post-mortem, “like whoever made a mistake was going to lose.”

Well, nobody in either Tiger or Mariner uniforms made any truly grave mistakes Friday night. The Mariners punched their ticket to the American League Championship Series the old-fashioned way, a hair-raiser of a ball game they finished when Jorge Polanco slashed a single with two out and the bases loaded in the bottom of the fifteenth.

Until that half-inning, the Tigers and the Mariners threw everything at each other except the proverbial kitchen sink. The sink showed up in the bottom of the fifteenth. When Tommy Kahnle relieved a gutsy Jack Flaherty for the Tigers, and J.P. Crawford opened the proceedings with a base hit, the third Mariners leadoff runner in four innings.

But Kahnle followed that by plunking Randy Arozarena on the first pitch, before Cal Raleigh lined out but left Arozarena safe at second thanks to Tigers center fielder Parker Meadows’s errant throw. Then the Tigers ordered Julio Rodriguez walked on the house. In situations leaving first base open with a season on the line, it was the smart move after dodging a Raleigh artillery shell.

Now came Polanco. He and Kahnle fought to a full count with no place to put him. Then Kahnle threw a fastball Polanco shot on a line through the right side and into right field, Crawford racing home and jumping onto the plate and into the arms of teammates who might have been forgiven if they’d just been wondering how much longer this epic could play.

“The back half of that game is like a game in itself,” said Tigers manager A.J. Hinch post-mortem. “We dodged a few bullets, and so did they . . . I didn’t want it to end, certainly,  the way that it did, but I wanted to just keep giving ourselves a puncher’s chance, and they outlasted us.”

Until the bottom of the fifteenth, it was fair to say the Tigers and the Mariners outlasted each other.

From the brilliance of starting pitchers Tarik Skubal and George Kirby to the magnificence of both bullpens plus a pair of starting pitchers pressed into all-hands-on-deck relief service, this game made you wonder whether anyone from the big bats to the supporting cast really knew how to hit anymore.

Skubal in particular pitched like the Cy Young Award winner he seems destined to become this year. He surrendered one run but set a new postseason record with seven straight strikeouts, then set another one with thirteen total strikeouts in a postseason elimination game. He pitched six virtuoso innings and left with his tank below empty.

How could he have known at that moment that things would end up with him making grand, Hall of Famer-like showings in his two ALDS starts but his team ending up on the losing side?

Kirby was almost as brilliant as Skubal. In fact, the only run charged against him scored when he’d left the game in the bottom of the sixth, after surrendering Baez’s leadoff double. Gabe Speier took over and Tigers right fielder Kerry Carpenter hit a 1-0 service into the right center field seats.

That gave the Tigers a 2-1 lead lasting long enough for the Mariners in the bottom of the seventh to tie it up with a little shuck-and-shuffling on the part of skipper Dan Wilson.

He sent Dominic Canzone to pinch hit for Mitch Garver, whose second-inning sacrifice fly opened the scoring in the first place. Hinch promptly brought Tyler Holton in to relieve Skubal’s relief Kyle Finnegan. Wilson countered by sending Leo Rivas up to pinch hit for Canzone.

In the first postseason plate appearance of his major league career, measuring Holton for the cutters and changeups he was most likely to throw, Rivas took a strike, then lined a changeup for a base hit to left to send Polanco home with the tying run.

From that point forward, the bullpens, with or without starters pressed into emergency all-hands-on-deck duty, were brilliant, even when they were slithering, sneaking, or bludgeoning their ways out of jams you could charge were some of their own making.

“It was like (we) got them on the ropes, and then they wiggle out of it. They got us on the ropes, and we wiggle out of it,” said Finnegan postgame. “It was an absolute roller-coaster of a game. That’s the beauty of this sport.”

“A heartbreaker of a finish,” said Tigers first baseman Spencer Torkelson, who’d gone hitless in six Game Five plate appearances, “but an unbelievable baseball game to be part of.”

“My experience feels like the ground was shaking every inning,” said Rivas. He wasn’t exactly wrong. Especially over the extra innings, when it seemed nobody in T-Mobile Park dared to sit back down.

“We knew this was not going to be a football score, that it was going to be a tight pitchers’ duel,” said Mariners president of baseball ops Jerry Dipoto, himself a former major league pitcher, “and our general take was: keep it close until Skubal’s out of there and we’ve got a chance to win this game.”

Even if it took nine innings from Skubal’s exit to do it. But once Speier yielded to Matt Brash, what came out of the Mariners’ bullpen—including and especially starters who hadn’t relieved in either eons or since early minor league days, whichever came first—was magnificent.

Brash himself got six outs for the first time since 2003. Andrés Muñoz, the Mariners’ usual designated closer, walked a pair but escaped and then pitched a spotless ninth. Logan Gilbert, a starter, pitched a pair of scoreless innings. Eduard Bazardo landed eight outs, something he’d never done in his career until Friday night. Luis Castillo, who hadn’t relieved in almost a decade, got rid of all four batters he faced.

The problem was the group of people rooting and cheering even louder than the ballpark crowd: the Blue Jays. Broadcast announcers noted it until even they got sick of saying it, but as the extra innings accumulated the Blue Jays had to have been roaring with delight knowing that, whichever team would meet them in the ALCS, that team’s pitching might be depleted temporarily.

That’s not what you want to throw at the Blue Jays and their own howitzer offense in their own playpen to open. The ALCS may come down to first and second game survival for the Mariners before they can bring the set back to T-Mobile Park. But when they do, the Mariners have at least one comfort upon which to lean: the Blue Jays were a game below .500 on the road while playing .667 ball at Rogers Centre.

And both teams want to end pennant droughts expeditiously as possible.

The Blue Jays haven’t hit the World Series since they won their second of two straight in 1993. The Mariners haven’t hit the World Series at all in their 48 years of existence. The last time they showed up in an ALCS, they’d won 116 games on the regular season, had the 2001 Rookie of the Year in future Hall of Famer Ichiro Suzuki, another Hall of Famer in Edgar Martinez, and lost to the Yankees.

The Tigers haven’t reached a World Series since 2006 or won one since 1984. They wouldn’t mind ending a drought, either. But on a night when Carpenter went four-for-five while the rest of the Tigers managed only four hits, Carpenter becoming the first since Babe Ruth to reach base five times and homer in a winner-take-all postseason game probably made Tiger fans wish they could have run nine of him to the plate Friday night.

It’s hard to think, “What a year,” when thinking of the Tigers. Sure, they’re talented, likeable, and their own kind of resilient. But these are the same Tigers who became this year’s first to win thirty, then forty, then fifty, then sixty games . . . before the worst September win percentage of any postseason baseball team ever. They played September as if on crutches.

The Mariners won their division handily enough, playing September with controlled fury and rolling their best month’s record of the season, 17-8/.680, while earning a round-one bye in the postseason. They proved unbreakable when the Tigers took them to the bitter end Friday night.

And the game proved unbreakable without Manfred Man, the free cookie on second base to begin each half inning. Manfred Man’s extinction should not be restricted to the postseason alone. No mistake.