In an epic bottom of the 15th inning, J.P. Crawford singled with no outs to get things started, followed by Randy Arozarena getting hit by a pitch to put the runners on first and second.
Cal Raleigh would hit one to deep center for the first out, but advanced both runners. Tigers pitcher Tommy Kahnle would walk Julio Rodriguez to load the bases for a possible double play.
But Jorge Polanco had other plans when he hit the walk-off to send the Mariners to their first ALCS in 24 years as the entire city of Seattle went into a frenzy.
Full game recap
After Mitch Garver got the Mariners on the board with a sac-fly in the bottom of the second inning to go up 1-0, it was all Skubal through the first six innings.
His seven straight strikeouts between the third inning and the start of the fifth inning are the most by a pitcher in MLB Postseason history. After finishing his six innings, giving up just one run on two hits, Skubal's 13 total strikeouts are now the most by a pitcher in a winner-takes-all game in postseason history as well.
He also became the only pitcher in MLB history to record multiple 13-strikeout games in the postseason.
Seattle's George Kirby went toe-to-toe with the game's best in Skubal, giving up one run on three hits in five innings of work while striking out six and also walking none.
Unfortunately, after giving up a double to the Tigers' Baez, Kirby was taken out for relief pitcher Gabe Speier.
Then, just like that, Detroit's Kerry Carpenter launched a two-run home run immediately to give the Tigers a 2-1 lead.
Then, postseason magic began to ensue for the Mariners now that they were done facing Skubal.
Seattle's Leo Rivas came in to pinch hit for Dominic Canzone, and, in his first-ever MLB Postseason swing, let alone at-bat, brought in the tying run on an RBI single in the bottom of the seventh.
Even better? It was on his birthday.
10th inning
Into the bottom of the 10th it went.
Seattle's Victor Robles doubled with no outs. But his teammates failed to bring him home after Detroit's rookie Troy Melton got himself out of the jam with a pop-out, strikeout, and groundout.
11th and 12th innings
Detroit's Carpenter advanced to second base following his single in the top of the 11th after Seattle catcher Cal Raleigh allowed a passed ball for the first time all season. But Detroit failed to bring him home.
They had another chance in the top of the 12th with bases loaded, but Seattle pitcher Eduard Bazardo got out of them unscathed.
Detroit reliever Keider Montero came in during the bottom of the 12th inning and walked Leo Rivas. Then, trying to catch him off guard at first, Montero overthrew on the pick-off, allowing Rivas to advance to second.
Then controversy ensued when Montero hit Victor Robles. After further review, the ball hit Robles and was not a foul ball off the bat, putting runners on second and third with no outs.
Then, after forcing J.P. Crawford to fly out to shallow left field, Detroit pulled off a double-play to end the inning, sending it into the 13th - where the Mariners walked it off.
13th inning
Bazardo would come back in for the top of the 13th inning - where he would strike out the side to give his Mariners teammates a chance to finally win it all - and it paid off.
Tigers starting pitcher Jack Flaherty came in the bottom of the 13th inning as a relief pitcher. He started the inning with back-to-back walks to Cal Raleigh and Julio Rodriguez, but struck out Jorge Polanco for the first out.
Then, he got Seattle's power hitter Eugenio Suarez to ground out into a double play to send it into the 14th, where the Mariners prevailed.
14th inning
With two outs in the top of the 14th, Mariners starting pitcher Luis Castillo came in as a reliever for the very first time in his entire major league career.
It officially became the longest winner-take-all game (by innings) in MLB Postseason history, which saw over 400 total pitches between both teams.
Flaherty would continue to hold the Tigers up for the time being.
They would get out of the 14th inning after catcher Dillon Dingler caught Robles trying to steal second.
On to the 15th inning, where the Mariners finally proved victorious.
The game saw a total of 15 pitchers, 472 pitches, and 37 total strikeouts.
Detroit finished the game 1-for-9 with runners in scoring position, the Mariners 2-for-11.
Josh Naylor was the only Mariners player to put up multiple hits (3-for-4), while Kerry Carpenter led the Tigers going 4-for-5, including his two-run home run.