AND HE WINS! Stan Wawrinka wins the US Open title 6-7, 6-4, 7-5, 6-3!
Wawrinka is now serving for the US Open title.
It appears Djokovic's toe is bleeding. Doesn't even look like he's in this anymore, but making a valiant effort to finish the match.
Two games away from the US Open title is Stan Wawrinka. Talk about stamina! Djokovic does not look himself, though, and there's something to be said for the fact that he's now barely able to move.
The fourth set sees Wawrinka lead 4-1 after saving break points with alarming consistency for Djokovic. Funnily, the Swiss has been excellent on his own break point conversion tonight.
The World No. 1 is down 1-3 in the fourth set and struggling to move although he's back on court.
Hard luck for Novak DJokovic right now. He's called for a Medical Time-out as he is struggling to go on.
Djokovic has had several opponents retire in the run up to the finals - and now with his injury, it looks like he could add to that list! Let's hope it is not an injury for the World No. 1.
Wawrinka leads 3-0 in the fourth and he's STILL got energy left. Amazing from the Swiss. Djokovic is clearly in pain. Cramps? Injury? One can't say right now.
And already leading Djokovic a set, Wawrinka's taken a break in the fourth. And Djokovic is hobbling around court cramping seriously.
Some really, really long rallies in this game. And Stan Wawrinka, take a bow. He leads 2 sets to 1 here and Djokovic is off-colour now.
Wawrinka has a 4-3 lead in the third set, and Djokovic is getting aggressive. He's pushing the game further now, and there's a full-stretch split to make that shot!
Wawrinka now leads 3-2, and somehow the energy seems to have shifted a bit towards Djokovic.
It's the Stan Wawrinka show through set 3 so far. He's leading 3-1 and at game point now. A man on a mission.
Wawrinka has taken Djokovic to seven break points so far and broken five times. 5/7 BP conversion is strong from the Swiss, while Djokovic is at 2 from 11. Not the best statistic for the World No. 1 to look at right now.
Wawrinka was down 0-30 and now he's at break point. And he BREAKS with a superb volley. A great passing shot and Stan Wawrinka leads 2-0 in the third set.
There's a bit of a scare but Wawrinka holds for a 1-0 lead in the third set and it's quite clear we have a contest on our hands.
UPDATE: Novak Djokovic receives a warning for 'racquet abuse'. This means the Serb is losing his cool when he really shouldn't be. He's pushing for the break now.
40-40 in the first game of the third set and Djokovic tries to hit it past his foot, sending it careening long. Wawrinka loses that advantage as he nets a shot, though.
A fantastic point from Novak Djokovic staves off that set point - but not for long! Djokovic sends the next shot wide and that gives Wawrinka the second set 6-4!
Set point Stan Wawrinka!
WOW that was close! Djokovic grunting, Stan staring, and that's a brilliant point that's JUST on the line (and no John McEnroe on court)...
Djokovic has held his service game, and now there's some exquisite shot placement from Wawrinka who is varying his net approaches. And he's got a hold to love, leading 5-4.
He sends a shot sailing past - and it looks long, but it's In! Djokovic wins that game to trail 3-4 in the second.
Djokovic is back with a hold to trail 2-4, but now in Wawrinka's service game the Serb looks a bit stressed attempting to cross the baseline.
Wawrinka HOLDS! He climbs out of a 0-40 hole to take that game - and a 4-1 lead.
Djokovic had a crucial chance to break back there but has flubbed that break point. He nets that serve, earning a fist pump from Wawrinka, who has the chance to hold now and go up!
He may have the new forehand but Wawrinka's backhand in form is something else and it's helped him get the break! He leads 3-1 in the second set.
If you thought Gael Monfils was athletic, Novak Djokovic could be a yoga practitioner - or a gymnast with that ridiculous flexibility! Baseline stretch-asana?
So far, so good as both players hold serve. Wawrinka is up on serve 2-1 now, and nobody's broken yet.
This is some great stuff from both players. A match worthy of a final.
Stan Wawrinka serves to open the second set and holds. Both his Grand Slam wins so far have come from being a set down - one against Djokovic, too, so he won't be too worried.
Magnus Norman looks disappointed, and we imagine after the effort he put in to get there, Wawrinka must be seething, too.
Djokovic wins the first set tiebreak 7-1, in the end quite decidedly one-sidedly. Not much of a contest in the tiebreak.
What an utterly beautiful point that was! A nineteen shot rally. Yes, 19. And that point goes to Stan Wawrinka. If only he could get multiple points for that one. An entire stadium is giving him a standing ovation for it, and it's deserved and then some.
Some great stuff here from Stan Wawrinka to absolutely come back into this.
He keeps it at the baseline for a while...and then runs to the net to bamboozle Djokovic with a drop shot!
That was a fabulous rally between the pair - and it ends well for Stan Wawrinka, who wins the point! He's now serving to stay in the set - and hopefully for him, force a first set tiebreak.
Djokovic has held his service game to love to lead 6-5, but he's looking tired and angry, likely at himself. It's a grim Boris Becker in the stands too.
Can you say Stan WOW-rinka right now?
Wawrinka very nearly holds to love in his service game right after the break back! He holds, which is what really matters. From two set points down, Wawrinka manages to equalize in the first set. Whatever the opposite of choking at crucial moments is, Wawrinka is doing it.
Two set points, and then Stan Wawrinka hits and makes Djokovic run across the baseline to make some shots. He can't. The Swiss holds his cool - and breaks Novak's serve as the Serb double faults precisely when he shouldn't have.
That thing they say about Novak Djokovic choking at crucial moments? This is it in action.
Enough has been said about the great Stan Wawrinka one-handed backhand, but my goodness, today his forehand is looking great, too! Guess that Magnus Norman coaching has really paid off recently.
Two set points down. And now Stan Wawrinka is at break point. Talk about a turnaround.
That was almost the end of it for Wawrinka in the first set - but the Swiss challenged at exactly the opportune time, perhaps, and it's given him another life in this set. He's still trailing 3-5, though, with Djokovic now hoping to serve out the set.
And he holds to love, leading 5-2 in that set! Wawrinka must now serve to stay in the set, not a good place for him to be.
Leading 4-2 at the moment, Djokovic is now at game point.
It's time for a double break, says Novak Djokovic, and his serves are getting more and more powerful as time progresses.
Wawrinka holds his own - and his serve to trail 1-3 in the final and it's really looking like Novak will run away with this win tonight.
And straightaway Wawrinka gets broken. With another hold of serve with some great forehands, Djokovic is quickly leading 3-0.
Djokovic goes full stretch to make that point - and he does, but misses a routine one right after!
Taking back what we said about Djokovic... that acrobatic stretch was brilliant! Can they give extra points for points scored like that?
Djokovic holds his opening service game to go up 1-0 in the first! Already it's looking a bit worrying for the Serb, though; a quick hold aside, his shot placement has not been ideal. But it's early days..
Novak Djokovic serves to open the match! A good point early on, but then he slides - almost like Monfils - and nets that forehand!
Wawrinka is primarily a baseliner, so some serve and volley experience is helpful.
Under the Swede, Wawrinka, who had a weak forehand despite his incredibly strong backhand, developed that too, in addition to adding serve-and-volley to his list of techniques.
Wawrinka has flourished under the coaching of former tennis pro Magnus Norman of Sweden.
With his French Open win, Djokovic has 12 Grand Slam titles, chasing Rafael Nadal, who holds 14. The all-time record for Men's Singles Grand Slam titles, of course, stands with Roger Federer - who has 17.
He won both his previous Grand Slam finals - against Rafael Nadal at the Australian Open in 2014, and against Novak Djokovic at the French Open last year. So he's unbeaten in Grand Slams, a specific stat that Novak Djokovic cannot stake claim to.
With today's final, Stan Wawrinka makes his third Grand Slam final.
In his pre-match interview, Djokovic says he is aware that Wawrinka will not be an easy opponent. "We've played each other at Grand Slams in finals for a while, and it is good for him, he is a player who gets much better as the tournament progresses."
It's almost time! Even among fans and experts, this isn't one-sided at all - many are giving Stan Wawrinka the win here!
Wawrinka's French Open win came with a defeat of Djokovic, whom the Swiss has a knack of troubling at the Grand Slam stage.
Wawrinka has never won the US Open, but is a two-time Grand Slam winner - winning the Australian Open in 2014, and the French Open in 2015.
The defending champion here at the US Open, Djokovic is already a two-time US Open winner, having taken the title once before last year, in 2011.
Novak Djokovic, who is the top seed here at Flushing Meadows, took the men's singles title last year with a victory over Roger Federer.