Spain's Rafael Nadal through to US Open final
Top seed beats Argentina's Juan Martin del Potro 4-6 6-0 6-3 6-2
Nadal to bid for third US Open and 16th major title on Sunday
South Africa's Kevin Anderson books place in first Grand Slam final
Anderson beats Spain's Pablo Carreno Busta 4-6 7-5 6-3 6-4
Jamie Murray & Martina Hingis reach mixed doubles final
*Anderson 3-5 Carreno Busta
"Let's go, Kev," screams a solitary voice from the crowd as he levels at 15-15 on Carreno Busta's serve.
That's all he gets, though. Carreno Busta holds with relative ease for a healthy lead.
Anderson will serve to stay in the first set.
Anderson 3-4 Carreno Busta*
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
You could see that last backhand from Kevin Anderson coming. He failed to get his feet up to the ball and was completely unbalanced. That is where those errors came from.
There have been a lot of fist pumps and noise from Anderson and it looks to me that he is nervous rather than pumped up. It looks a little forced.
Image source, Getty ImagesAnderson 3-4 Carreno Busta*
Now then, do we have a break opportunity approaching?
Anderson double faults and nets a ground stroke for 0-30.
The 28th seed finds a winner for 15-30 but then another error on the forehand.
Two break points Carreno Busta!
The first is saved with an Anderson ace, but a wild, wild double-handed backhand gives the game to the Spaniard.
Image source, Getty Images*Anderson 3-3 Carreno Busta
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
Both these guys have been pretty accurate with their first serves with 77% of first serves landing for Anderson and 73% for Carreno Busta.
*Anderson 3-3 Carreno Busta
Anderson takes some small bites out of Carreno Busta's serve at 30-30.
But the South African overcooks a backhand and then Carreno Busta sends home a pacy serve to hold.
Image source, ReutersAnderson 3-2 Carreno Busta*
There's not a sniff of a break yet.
Kevin Anderson lands a second serve ace down the T to hold to love.
Cancel your Friday night plans. We're in for a long night.
*Anderson 2-2 Carreno Busta
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
Kevin Anderson plays with such a big game with a massive serve and cracking forehand and that means that he doesn't rely so much on his movement.
He has suffered with a series of injuries in recent years and I think they have had to be careful with his schedule to make she he does not overload himself.
The longer the rallies go though I think it is going to favour Pablo Carreno Busta.
Image source, EPA*Anderson 2-2 Carreno Busta
Carreno Busta is victorious in the first battle at the baselines after Anderson nets.
The South African punts long to give his Spanish opponent a 40-0 lead.
The 12th seed holds as Anderson finds the net again.
Anderson 2-1 Carreno Busta*
I'll be honest, I've not seen much of Kevin Anderson during my time covering tennis. But even a novice can see what his biggest weapon is: his serve.
His third ace is thrown down and Carreno Busta is unable to return a 134mph thunderbolt as the 28th seed holds again.
Image source, EPA*Anderson 1-1 Carreno Busta
Our first proper exchange arrives with Carreno Busta 15-0 up.
Anderson goes for the forehand winner but it lands just wide.
The South African gets it right for the next point by coming forward to the net and wrong-footing his opponent.
Carreno Busta settles down and goes on to hold.
Image source, EPA*Hingis & Murray 2-1 Vandeweghe & Tecau
Image source, Getty ImagesJamie Murray and Martina Hingis, Wimbledon champions and top seeds, have just got going in the mixed doubles semi-finals.
On the other side of the net are Coco Vandeweghe - who crashed and burned in her singles semi-final against Madison Keys last night - and Romanian 32-year-old Horia Tecau.
Tecau apparently has written a children's book called 'Viata in ritm de tenis' (Life in the rhythm of tennis) that encourages kids to pursue their dreams through hard work.
Remember when Sarah Ferguson released her Budgie the Helicopter books featuring anthropomorphic aircraft. That was weird wasn't it?
Anyway.
Hingis and Murray are already a break up at 2-1.
Russell Fuller
BBC tennis correspondent at Flushing Meadows
We've missed Djokovic, Murray, Wawrinka, Raonic and Nishikori - we enjoy their duels when in peak form - but they aren't here and we should celebrate the next level of players. These two have battled hard to reach this stage.
Anderson 1-0 Carreno Busta*
And we start with an almighty ace!
Pablo Carreno Busta then shanks long on two occasions to make it 40-0.
Kevin Anderson sees the game out with another ace. Start as you mean to go on, big man.
Image source, Getty ImagesAnderson 0-0 Carreno Busta
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
Both of these guys are going to start the match with a bit of nerves and I think the result may well depend on who can calm those nerves the quickest in this first set.
Image source, Getty Images*Anderson 0-0 Carreno Busta
Here we go then.
The first men's singles semi-final is about to get started. Kevin Anderson will serve first.
Piers Newbery
BBC Sport at Flushing Meadows
Things don't tend to kick off exactly on time around here, which is handy for those still making their way into the grounds from the Mets-Willetts Point subway stop. The journey from Manhattan on the 7 Line takes about half an hour and is packed with school kids as well as tennis fans at this time of day.
The experience is pretty similar in terms of time and comfort to the District Line, for anyone who has made that journey to Wimbledon, and the 10 Line to Porte d'Auteil, for any French Open regulars.
It does not compare to a stroll along the banks of the Yarra river in Melbourne, however. Hard to beat.
Image source, BBC SportNadal v Del Potro
David Law
Radio 5 live sports extra commentator at Flushing Meadows
A lot of these shirts around already. It's going to be a cracking atmosphere tonight.
The players have just had a quick chat with the on-court interviewer. Any clues from their pre-match words? Probably not, although did Big Kevin sound a bit nervous?
Kevin Anderson: "This is a new stage for both of us and I'm looking forward to it. Pablo is a great player, a great fighter but I feel I'm playing great tennis."
Pablo Carreno Busta: "I will try to be aggressive and take advantage of my chances - that will be key. I will give 100%."
Image source, Getty ImagesNow this is an interesting suggestion - could able-bodied players start playing wheelchair tennis? That's what former world number one Stephane Houdet is hoping will happen.
Houdet has already discussed his proposal with other top male players and disability sports officials, with the end goal being wheelchair tennis becomes an Olympic event.
Novak Djokovic tested his abilities in Melbourne earlier this year, facing Paralympic champion Dylan Alcott during a charity event before the Australian Open.
Read the full interview with Houdet here.
Image source, Getty ImagesJill Craybas
Former world number 39 on BBC Radio 5 live sports extra
Both players will be nervous and will be thinking about the great opportunity they have. It will be a great battle to watch - and probably a long one - because of the contrasting styles, with Anderson's big serve and attacking shots and Carreno Busta with his baseline ground strokes.
Image source, EPA