The Dodgers losing streak reached seven Friday night in Arizona, and it ended the way the ugly ones always end: one rookie, one swing, one very quiet bus ride. Ryan Waldschmidt's two-run walk-off homer off Edwin Diaz turned a 3-2 Los Angeles lead into a 4-3 Diamondbacks win, and a bad week officially became a season-high skid.

Seven in a row. For this roster. In August.

What happened in the Dodgers vs. Diamondbacks game Friday night

Los Angeles carried a one-run lead into the ninth with its closer on the mound, which is the whole point of building a bullpen the way the Dodgers build one. Diaz has been doing this job at an elite level for the better part of a decade, and the math on him has always been simple: swing-and-miss stuff, strikeouts by the fistful, and enough margin that a one-run lead usually feels like two.

Friday it felt like none. Waldschmidt got a pitch he could lift, and the rookie put it in the seats with a man aboard. Two runs, game over, 4-3, and a ballpark that had spent the night waiting for a reason to lose its mind found one.

That's not a bullpen collapse in the abstract. That's a young hitter beating a great pitcher on one pitch, which is the part of this sport that no spreadsheet has ever fully domesticated.

Why are the Dodgers losing seven in a row?

Streaks like this are almost never one broken thing. They are a starter going five, a lineup stranding traffic, a leverage arm missing over the plate by four inches, and all of it landing in the same nine-day window until it looks like a diagnosis instead of a stretch of bad baseball.

What makes Friday sting more than the six before it is the shape of it. Losing 8-1 is a bad night. Losing a game you led into the ninth, with the guy you pay to finish it standing on the mound, is the kind of loss that follows a clubhouse into the next day. Ask anyone who has ever worn the uniform. The blowouts you forget by breakfast. The walk-offs live in your chest for a while.

checked the almanac: the 2017 dodgers were 91-36, then lost 16 of 17 across late august and september, and still played in the world series that october. streaks lie about good teams more often than they tell on them. that's real, and it's also cold comfort at midnight in phoenix.

Who is Ryan Waldschmidt and what it means for Arizona

For the Diamondbacks, this is the part of a season that doesn't show up in the standings. Waldschmidt is a rookie, and rookies remember the first time they beat a name. Doing it against a closer of Diaz's pedigree, in a one-run game, with the home crowd on its feet, is the sort of at-bat a young hitter files away and keeps drawing on. Arizona has spent years developing bats and watching them mature in exactly these spots.

The D-backs also just took a game from the best-resourced roster in the sport on a night the Dodgers had it won. Nothing about the season changes. Everything about the room changes for a day.

What comes next for the Dodgers

They get the immediate rematch. Same building, Saturday at 8:11 PM ET, which is either the cruelest scheduling in the world or the kindest, depending on whether you think a team wants to sit with a loss or bury it.

What I'm watching: how Los Angeles handles the ninth inning the next time it has one. Not whether Diaz pitches again, he will, and he should. Whether the manager runs him back out at the first opportunity, and whether the lineup gives him a two-run cushion instead of asking him to be perfect. Seven straight is a number that gets fixed one clean night at a time, and the Dodgers have won a lot of them.

The streak ends when it ends. It usually does.