Iga Swiatek remains the form player coming into this one.

Her maiden Wimbledon title in July was followed by a big win on the hard courts of Cincinnati - a WTA 1000 event - and she has looked in fine tune in New York.

Chasing a second US Open title and seventh Grand Slam, she would face Naomi Osaka or Karolina Muchova in the semi-final.

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Our first women's quarter-final of the day sees Amanda Anisimova take on Iga Swiatek in a repeat of the Wimbledon final, where the American was thrashed by the Polish second seed 6-0 6-0.

That was incredibly tough for Anisimova and she'll be hoping to have learnt some lessons there that she can incorporate today.

She said that day that she was "frozen with nerves" so let's hope that is not the case here and we can see some of the tennis that got Anisimova to the Wimbledon final in the first place.

This New York crowd will not want to see this over in less than an hour.

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Right, let's turn our attention to our first women's quarter-final of the day. They've been made to wait long enough...

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Four-time US Open wheelchair men’s singles champion Alfie Hewett has begun the defence of his title with a quickfire win over Charlie Cooper of the USA.

Hewett, who also beat Cooper in the men's doubles yesterday, took just 61 minutes to wrap up a 6-0 6-2 victory and reach the quarter-finals.

The 27-year-old second seed is aiming to lift the trophy for the third time in a row.

Meanwhile, in the quad singles, Britain's Greg Slade, who is making his US Open debut, saved three match points to reach the quarter-finals with a 6-3 4-6 7-6 (11-9) victory over Brazil's Leandro Pena.

Felix Auger-Aliassime after beating Alex De Minaur: "I think it was just a lot of nerves today during the whole match. It wasn't pretty at all times but that's what Grand Slam matches are - some days you won't feel your best but I was willing to dig really deep to stand here right now."

On reaching his first Grand Slam semi-final since 2021: "It feels amazing. Four years ago - it feels like more, honestly, it was a tough couple of years, but it feels even better now to be back in the semi-finals. It's been an amazing tournament to so far.

"It's not over, there's still some tennis to play. The biggest challenges are yet to come but that's what I live for, that's what I train for so I'm going to show up and be ready for my match on Friday."

Abigail Johnson
Commentator on BBC Radio 5 Sports Extra and BBC Sounds

It was really interesting to see Auger-Aliassime smiling on the microphone after the match, he didn't have the air of a guy who came through a massive mental situation that he has done.

You even saw him smiling at critical moments when he had made a mistake that he wouldn't in an average match. He handled that aspect better than De Minaur.

Felix Auger-Aliassime will have to wait until the early hours of tomorrow morning (UK time) to discover who he faces in the semi-finals, but he knows for certain they will be Italian.

World number one Jannik Sinner takes on compatriot and 10th seed Lorenzo Musetti in the last remaining quarter-final later on.

Mark Woodforde
17-time Grand Slam doubles champion on BBC Radio 5 Sports Extra and BBC Sounds

Gutsy play from both players, they had to try and survive with a bunch of nerves out there.

I'm not sure if Auger-Aliassime ever located his game, but at the crucial moments at the back end of sets he was able to utilise his weapons. He got some crucial points behind the serve and with the forehand.

He never lost composure, he kept his head down and worked hard.

It's heartbreak for Alex de Minaur in the quarter-finals once again.

The last eight of the Grand Slam remains a hurdle he is yet to overcome - he's exited four of his last six majors at this stage.

Here we go.

Felix Auger-Aliassime is on serve and has two match points.

Another double fault from Alex de Minaur prevents him from further closing in on Felix Auger-Aliassime.

Do either of them want to reach the semi-finals?

Finally a hold of serve. Felix Auger-Aliassime forces over a forehand and Alex de Minaur can't get it back.

Oh my.

Another double fault from Auger-Aliassime - that's his second in this tie-break - invites De Minaur back in.

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Wow!

All four points in this tie-break have gone against the serve as Alex de Minaur returns into the net.

Make that all five.

Apparently it's contagious.

Felix Auger-Aliassime with a double fault to hand back the mini-break.

The Canadian gets his second serve in next time round but then goes long to hand the advantage to Alex de Minaur.

Far from ideal start from Alex de Minaur as he double faults.

Nerves?

The clock ticks over four hours as Felix Auger-Aliassime backtracks, watches the ball drop from the sky and slams an overhead volley to lead 30-15.

Auger-Aliassime benefits from a long Alex de Minaur forehand to lead 40-15.

And he takes it to a tie-break when De Minaur's return is wide.

Your guess is as good as mine with how this match finishes!

Right, crunch time.

Either Alex de Minaur breaks and forces a deciding fifth set or Felix Auger Aliassime holds to take us to a tie-break.

Alex de Minaur came out swinging in this set and it's only about 15 minutes ago that he picked up a second successive hold to love and led 5-2.

But the theme of this match - on both sides of the net - has been a lack of consistency and inability to enjoy sustained periods on top.

After losing three games in a row, De Minaur responds strongly to hold and put the pressure back on Felix Auger-Aliassime.

Felix Auger-Aliassime comes up with his 22 ace of the match - powering his serve straight down the middle - to lead 40-15.

Alex de Minaur gets to 40-30 but that's as good as it gets for the Australian as the 25th seed holds.