5:46 PM—Andreescu leads, 5-4: Andreescu hits a short backhand long to fall behind 0-30, and she stares at the court in a stunned state. When Williams wins the next point, for 0-40, Andreescu walks to the baseline with her fingers in her ears, yelling at herself.
When Williams breaks, Andreescu falls to her seat—and nearly everyone in Arthur Ashe Stadium rises in an uproar.
Down two breaks, Williams will serve to level the second set.
5:42 PM—Andreescu leads by a break, 5-3: The crowd is the loudest it's been all match, by far, after Serena holds with relative ease. Big-time pressure on Andreescu now, serving for the title for a second time.
5:38 PM—Andreescu leads by a break, 5-2: Down to her last point, Serena hits a return winner to stay alive. It's enough to rattle Andreescu—for the first time this match, I notice her taking extra time bouncing the ball.
And on Serena's second break point, she converts. It's a long hill still to climb, but let's see what happens from now.
5:31 PM—Andreescu leads by a break, 5-1: If Serena Williams is to tie Margaret Court with her 24th major, she'll need to do so from nearly the greatest deficit in women's tennis: down a set and 5-1. She's broken in the game, and looks broken mentally as well.
Her only saving grace may be that it's now Andreescu who has everything to lose.
5:28 PM—Andreescu leads by a break, 4-1: With few answers for Andreescu, Serena is going for everything now. Sometimes that's devastating, but right now, is has the air of desperation. Williams only musters one point against a locked-in Andreescu, who is two games away from winning her first major, and handing Serena her fourth consecutive loss in a Grand Slam final.
5:24 PM—Andreescu leads by a break, 3-1: Williams has a game point to get level with Andreescu in a set for the first time all match (aside from 0-0 scores). She double faults—her fifth of the afternoon.
And in a massive shift in momentum, Andreescu wins the next two points to regain her break-of-serve lead. Crowd still trying its best to will Williams back into form, including Alexis Ohanian, who's been as demonstrative as Andreescu courtside.
5:17 PM—Andreescu leads, 2-1: Serena finally gets into an Andreescu's service game, doing what Bianca has done to her throughout this match: hitting big on the return. But it's actually her weakest return of the four break points she plays that leads to the break. A net-cord winner stops the Andreescu surge; lucky or not, Williams desperately needed something to go her way. Let's see how both players react.
5:09 PM—Andreescu leads by a break, 2-0: Andreescu is reminding me a bit of Novak Djokovic in the zone. Everything is coming back with pace—especially when it's pace that coming her way.
She's flummoxed Williams, who double faults to end the game. Elapsed time: 51 minutes.
5:07 PM—Andreescu leads, 1-0: After holding the first game, Andreescu keeps up the intensity with a yell and a hop. She's in command right now.