So, after two polar opposite matches we know our 2016 US Open finalists, Novak Djokovic will face Stan Wawrinka on Sunday night.
But, before then we have British interest don't forget.
Tomorrow evening Jamie Murray and partner Bruno Soares will play in the men's doubles final and we'll bring you live commentary right here from 17:00 BST.
Following that, it is the women's final, as Karolina Pliskova takes on Angelique Kerber.
Join us then.
'The final will be something special'
Some quotes from Stan Wawrinka, who will play Novak Djokovic in Sunday's final.
"It was tough conditions," says Wawrinka. "I saw the first semi-final and it is really humid, really hot and I knew it would be really tough.
"Kei is a tough player and he played well from the beginning. I had to wait and fight and make him a bit uncomfortable and he started to get tired. That is when I put my game to be aggressive. To be in the final is something crazy.
"I'm really excited. I have watched the final so many times here and to play Novak Djokovic is going to be something special. Hopefully I will be ready and let's see what will happen."
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Post update
Wawrinka 4-6 7-5 6-4 6-2 Nishikori
Getty ImagesCopyright: Getty Images
Post update
Wawrinka 4-6 7-5 6-4 6-2 Nishikori
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
Stan has really lifted his level and he had to today as Nishikori came out firing on all cylinders at the start.
Wawrinka finally found an edge in the second set and had more confidence and energy in the third and fourth sets.
Game, set and match
Wawrinka 4-6 7-5 6-4 6-2 Nishikori
Stan Wawrinka is into his first US Open final.
Wawrinka struggled early on against an impressive Nishikori but found his game and powers his way into the final to face Novak Djokovic.
He was one point from exiting in round three but is now one match from his third Grand Slam title.
AFPCopyright: AFP
Two match points
Wawrinka 4-6 7-5 6-4 5-2 Nishikori
Big return from Wawrinka right to the feet of Nishikori for 0-15. A forehand error from Nishikori. Stan is two points from the final.
He misses with the next return but wins the next point. Two match points.
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Post update
*Wawrinka 4-6 7-5 6-4 5-2 Nishikori
Wawrinka is a game away from the final.
The narrowest of hawkeye decisions goes the way of the Swiss to give him 40-0 before a vicious kick serve seals the game.
The Nishikori supporters in the crowd look like they know the game is up.
What does he have left?
Getty ImagesCopyright: Getty Images
Post update
*Wawrinka 4-6 7-6 6-4 4-2 Nishikori
David Law
Radio 5 live sports extra commentator
I wonder if Kei Nishikori has run out of gas now.
APCopyright: AP
Another break from Wawrinka
*Wawrinka 4-6 7-5 6-4 4-2 Nishikori
The crowd are right behind the Japanese player, they want a fifth set. Big groans as he puts a drop shot into the net.
Winner number 37 for Wawrinka takes us to deuce.
Big trouble for Nishikori as a bad forehand error hands Wawrinka break point.
He takes it.
Nishikori has broken serve once this set but he must do it again or he is going home.
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Nishikori breaks back!
Wawrinka 4-6 7-5 6-4 3-2 Nishikori*
A shocker of a service game from Wawrinka. A double fault takes us to 0-40 and three break points for Nishikori.
Nishikori misses a backhand down the line, 15-40.
Big serve from Wawrinka, 30-40.
He's done it. I'm sorry I doubted you Kei. A brilliant rally ends with a Wawrinka passing shot landing just wide.
Do not go to sleep. This one isn't over yet.
Getty ImagesCopyright: Getty Images
Post update
*Wawrinka 4-6 7-5 6-4 3-1 Nishikori
APCopyright: AP
Post update
*Wawrinka 4-6 7-5 6-4 3-1 Nishikori
Well said David. Nishikori looks like the deflated balloon, a week on after the party.
He's stopped the rot though. A comfortable hold of serve and Nishikori is still fighting.
Post update
Wawrinka 4-6 7-5 6-4 3-0 Nishikori
David Law
Radio 5 live sports extra commentator
Kei Nishikori looks like a popped balloon at the moment. He doesn't inspire great confidence that a comeback is coming.
APCopyright: AP
Post update
Wawrinka 4-6 7-5 6-4 3-0 Nishikori*
Stan Wawrinka saved a match point against Britain's Dan Evans in round three but now he's just three games from his first US Open final.
Two double faults from Stan in that game but Nishikori still can't make him pay, his 39th unforced error of the match hands Wawrinka the game.
Post update
*Wawrinka 4-6 7-5 6-4 2-0 Nishikori
David Law
Radio 5 live sports extra commentator
Stan Wawrinka is really hitting a hot streak now. He is wrestling the momentum of this match away from his opponent.
Wawrinka breaks in fourth set
*Wawrinka 4-6 7-5 6-4 2-0 Nishikori
This is brutal, brutal hitting from Wawrinka now.
He can't miss, every ball with pace and depth.
A jaded looking Nishikori can't handle it and there is the break to love.
This has been a great match but we may be heading towards a swift conclusion.
APCopyright: AP
Post update
Wawrinka 4-6 7-5 6-4 1-0 Nishikori*
It was all Wawrinka in that game.
Another thumping winner is followed by a delightful drop shot.
He has got it all and Nishikori has it all to do.
Post update
Wawrinka 4-6 7-5 6-4 0-0 Nishikori
That was a topsy-turvy set.
Wawrinka seemed to have it in the bag before Nishikori came charging back, only to see it snatched away again.
It must be a tough one for Nishikori to take but he's been in this situation before, just two days ago in fact.
APCopyright: AP
Get Involved #bbctennis
HR: This match is finely poised! Stan has more firepower though and I'm backing him to win in four.
Post update
*Wawrinka 4-6 7-5 6-4 Nishikori
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
A great response by Stan Wawrinka. He really got aggressive and got rewarded for that. The energy he took from the second set to the third has really benefited him.
Live Reporting
Matthew Henry and Michael Emons
All times stated are UK
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Latest PostSee you tomorrow
So, after two polar opposite matches we know our 2016 US Open finalists, Novak Djokovic will face Stan Wawrinka on Sunday night.
But, before then we have British interest don't forget.
Tomorrow evening Jamie Murray and partner Bruno Soares will play in the men's doubles final and we'll bring you live commentary right here from 17:00 BST.
Following that, it is the women's final, as Karolina Pliskova takes on Angelique Kerber.
Join us then.
'The final will be something special'
Some quotes from Stan Wawrinka, who will play Novak Djokovic in Sunday's final.
"It was tough conditions," says Wawrinka. "I saw the first semi-final and it is really humid, really hot and I knew it would be really tough.
"Kei is a tough player and he played well from the beginning. I had to wait and fight and make him a bit uncomfortable and he started to get tired. That is when I put my game to be aggressive. To be in the final is something crazy.
"I'm really excited. I have watched the final so many times here and to play Novak Djokovic is going to be something special. Hopefully I will be ready and let's see what will happen."
Post update
Wawrinka 4-6 7-5 6-4 6-2 Nishikori
Post update
Wawrinka 4-6 7-5 6-4 6-2 Nishikori
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
Stan has really lifted his level and he had to today as Nishikori came out firing on all cylinders at the start.
Wawrinka finally found an edge in the second set and had more confidence and energy in the third and fourth sets.
Game, set and match
Wawrinka 4-6 7-5 6-4 6-2 Nishikori
Stan Wawrinka is into his first US Open final.
Wawrinka struggled early on against an impressive Nishikori but found his game and powers his way into the final to face Novak Djokovic.
He was one point from exiting in round three but is now one match from his third Grand Slam title.
Two match points
Wawrinka 4-6 7-5 6-4 5-2 Nishikori
Big return from Wawrinka right to the feet of Nishikori for 0-15. A forehand error from Nishikori. Stan is two points from the final.
He misses with the next return but wins the next point. Two match points.
Post update
*Wawrinka 4-6 7-5 6-4 5-2 Nishikori
Wawrinka is a game away from the final.
The narrowest of hawkeye decisions goes the way of the Swiss to give him 40-0 before a vicious kick serve seals the game.
The Nishikori supporters in the crowd look like they know the game is up.
What does he have left?
Post update
*Wawrinka 4-6 7-6 6-4 4-2 Nishikori
David Law
Radio 5 live sports extra commentator
I wonder if Kei Nishikori has run out of gas now.
Another break from Wawrinka
*Wawrinka 4-6 7-5 6-4 4-2 Nishikori
The crowd are right behind the Japanese player, they want a fifth set. Big groans as he puts a drop shot into the net.
Winner number 37 for Wawrinka takes us to deuce.
Big trouble for Nishikori as a bad forehand error hands Wawrinka break point.
He takes it.
Nishikori has broken serve once this set but he must do it again or he is going home.
Nishikori breaks back!
Wawrinka 4-6 7-5 6-4 3-2 Nishikori*
A shocker of a service game from Wawrinka. A double fault takes us to 0-40 and three break points for Nishikori.
Nishikori misses a backhand down the line, 15-40.
Big serve from Wawrinka, 30-40.
He's done it. I'm sorry I doubted you Kei. A brilliant rally ends with a Wawrinka passing shot landing just wide.
Do not go to sleep. This one isn't over yet.
Post update
*Wawrinka 4-6 7-5 6-4 3-1 Nishikori
Post update
*Wawrinka 4-6 7-5 6-4 3-1 Nishikori
Well said David. Nishikori looks like the deflated balloon, a week on after the party.
He's stopped the rot though. A comfortable hold of serve and Nishikori is still fighting.
Post update
Wawrinka 4-6 7-5 6-4 3-0 Nishikori
David Law
Radio 5 live sports extra commentator
Kei Nishikori looks like a popped balloon at the moment. He doesn't inspire great confidence that a comeback is coming.
Post update
Wawrinka 4-6 7-5 6-4 3-0 Nishikori*
Stan Wawrinka saved a match point against Britain's Dan Evans in round three but now he's just three games from his first US Open final.
Two double faults from Stan in that game but Nishikori still can't make him pay, his 39th unforced error of the match hands Wawrinka the game.
Post update
*Wawrinka 4-6 7-5 6-4 2-0 Nishikori
David Law
Radio 5 live sports extra commentator
Stan Wawrinka is really hitting a hot streak now. He is wrestling the momentum of this match away from his opponent.
Wawrinka breaks in fourth set
*Wawrinka 4-6 7-5 6-4 2-0 Nishikori
This is brutal, brutal hitting from Wawrinka now.
He can't miss, every ball with pace and depth.
A jaded looking Nishikori can't handle it and there is the break to love.
This has been a great match but we may be heading towards a swift conclusion.
Post update
Wawrinka 4-6 7-5 6-4 1-0 Nishikori*
It was all Wawrinka in that game.
Another thumping winner is followed by a delightful drop shot.
He has got it all and Nishikori has it all to do.
Post update
Wawrinka 4-6 7-5 6-4 0-0 Nishikori
That was a topsy-turvy set.
Wawrinka seemed to have it in the bag before Nishikori came charging back, only to see it snatched away again.
It must be a tough one for Nishikori to take but he's been in this situation before, just two days ago in fact.
Get Involved #bbctennis
HR: This match is finely poised! Stan has more firepower though and I'm backing him to win in four.
Post update
*Wawrinka 4-6 7-5 6-4 Nishikori
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
A great response by Stan Wawrinka. He really got aggressive and got rewarded for that. The energy he took from the second set to the third has really benefited him.