Up next? These two.

Emma Sanders is here to take you through it.

See ya!

Image source, Getty Images

"Just the beginning."

...Female tennis players all over the world weep.

Serena Williams: "I don't know, I knew I had to play better [than the opening two games]. The crowd was so intense and helped me out after those first two games. I wanted to give them the best that I can.

"I have been working hard on my volleys. I have won a few doubles championships so I know how to volley. I usually only come into the net to shake hands! But I was paying such a good player so I knew to have a chance I would have to come in.

"I tried something different today and it worked in my favour. It's honestly really incredible. A year ago I was fighting after having the baby.

"I am just so grateful that I have an opportunity to play this sport. No matter what happens in semi-finals or finals, I feel like I have already won by just being here.

"Anything for me is a win to come this far so fast. I am just beginning. It has only been a few months. I am looking forward to the rest of the year and next year. I am looking forward to the possibilities."

Sevastova doesn't stick around. Off she goes and Serena stands and applauds her. Classy.

Now for the post-match interview.

"A year ago I was fighting literally for my life at the hospital after the baby," Williams says. Could that first Grand Slam since giving birth come on Saturday?

Jeff Tarango
Former professional tennis player on BBC Radio 5 live sports extra

Sevastova looks like a cage fighter who has just lost. She is absolutely crushed.

Williams and Sevastova shake hands at the net before the American does her trademark pirouette.

She lost those first two games but then blitzed her opponent.

She spent just an hour and three minutes on court.

Jonathan Jurejko
BBC Sport at Flushing Meadows

Wow. Ashe rises to its feet to celebrate an impressive win for their hero. If they're not clapping then they are whooping with a camera phone in hand to mark the moment they saw Serena win.

Sevastova into the net. Her head drops.

Three match points to Williams. The crowd roar as if she has won the title already.

Drive volley smashed away.

30-0.

Spidercam zooms around Serena Williams for what will likely be the final time in this match.

Ace to start.

15-0.

Russell Fuller
BBC tennis correspondent on 5 live sports extra at Flushing Meadows

This is another exceptional Serena Williams performance! If we can't have a contest, let's just enjoy the way this great champion is playing. She is streets ahead.

Just. Too. Good.

Sevastova has no answer. She just can't compete. A 28th winner means Williams will now serve for a place in the final of the US Open.

It's just unstoppable. This time a backhand winner from Williams.

Two more break points.

Williams really is human. After that missed volley she double faults. The crowd are stunned.

But Sevastova can't convert. The ball is flying off her racquet and not in a good way. It's long and wide.

We've just ticked beyond the hour mark. Serena is in a rush.

Serena Williams has missed a shot at the net! I repeat. Serena Williams has missed a shot at the net!

0-15.

Russell Fuller
BBC tennis correspondent on 5 live sports extra at Flushing Meadows

Image source, Getty Images

Someone has to produce something exceptionally well to prevent Serena Williams from winning her seventh US Open title.

There's the double break! Naomi and Madison - get your skates on. You'll be up soon.

Serena Williams is up at 24 winners from just 11 games. This is the best I have seen her play in a long, long time. The crowd are loving it. They're being treated to something special.

Williams is moving well too. The American sprints to pick up a drop shot.

Here's another break point. This is surely effectively a match point.

The Williams box looks so calm now. Coach Patrick is looking down fiddling with his fingers. Husband Alexis is unmoved. Someone has even got a dog in there!

Sevastova gets to 30-30 but Williams wins the game with two more excellent volleys. She's like an octopus at the net, getting her racquet on absolutely everything.