Christian Walker’s home run left the bat at 108.2 mph and landed 405 feet away, and the Astros needed every inch of it. By the time Walker stepped into the box in the bottom of the 10th, Houston had already blown the lead in the eighth and fallen behind again in the top of the inning. This wasn’t a team saved by one big swing. It got knocked down twice and answered twice, and the second answer turned into a walk-off.

Seattle tied it at 5-5 in the eighth, the kind of gut-punch that ends a lot of games right there. It didn’t end this one. Victor Robles ripped an RBI triple in the top of the 10th, Brock Rodden added a sacrifice fly off Bryan Abreu, and the Astros were down 7-5 with three outs standing between them and a loss they’d already coughed up once.

Isaac Paredes and Daulton Varsho each singled with two outs in the bottom of the 10th off Mariners closer Andres Munoz to tie it back up at 7-7. Then Christian Walker’s walk-off homer made it 10-7: three runs, 405 feet, 108.2 mph off the bat, his 23rd of the season.

Twenty-three homers, and that’s the one that gets the highlight package for the rest of the year.

Houston’s dugout knew exactly what it had before the ball landed:

https://twitter.com/MLB/status/2088471071905251582

I rewatched that Mariners half-inning twice, and Seattle never looked like a team that remembered it was up two runs. That’s not a knock on Robles or Rodden, who both did their jobs cleanly. It’s that the Astros-Mariners game, an AL West matchup that needed extra innings, had already flipped once, and everyone in the building seemed to sense it could flip again before it actually did.

Plenty of teams blow a lead in the eighth and spend the ninth and 10th playing not to lose. Houston spent that stretch playing like the deficit was a technicality. Paredes and Varsho didn’t work walks or wait for a mistake — they attacked a closer who’d converted plenty of these before and got the tying runs in on back-to-back two-out singles. Walker just finished the job with the loudest possible exclamation point.

That’s the Astros’ season-high AL West lead now: three games over Texas, with Houston sitting at 63-60.

Seattle dropped to six games back after a loss that will sting for a while. Margins like that are exactly why the 24-team scramble for a playoff spot rewards teams that don’t rattle — one bad inning doesn’t cost you in August the way it costs you in March.

Nobody outside Houston will remember Robles’ triple or Rodden’s sac fly by October. What they’ll remember is that none of it mattered — the Astros blew a lead and got run down again and treated both like a formality.

Good teams get remembered for the walk-off. Great ones get built on what happens two innings before it.