Postpublished at 22:50 British Summer Time 7 September 2018
*Nadal 6-7 (3-7) 1-2 Del Potro
Oh dear...
A medical time-out has just been called too. Maybe it's more than a knee-strapping job?
Novak Djokovic to face Juan Martin del Potro in Sunday's final
Djokovic beats Kei Nishikori 6-3 6-4 6-2
Del Potro through after Rafael Nadal retires
Defending champion Nadal concedes because of knee injury
Argentine Del Potro led 7-6 (7-3) 6-2 when Nadal quit
Matthew Henry and Emma Sanders
*Nadal 6-7 (3-7) 1-2 Del Potro
Oh dear...
A medical time-out has just been called too. Maybe it's more than a knee-strapping job?
*Nadal 6-7 (3-7) 1-2 Del Potro
The trainer is out again. Looks like Nadal's tape around his knee was strapped on too tightly. He's getting it re-done now, along with a little massage.
*Nadal 6-7 (3-7) 1-2 Del Potro
Del Potro plays a perfect drop shot - which caresses the net cord and stops on the other side of the net.
He then sets up a net volley and quickly draws up 40-0.
A fizzing serve rounds off the game.
Nadal 6-7 (3-7) 1-1 Del Potro*
A drop shot attempt from Del Potro falls short and Nadal gets the hold of serve.
What a start to the second set. 15 minutes already passed.
The players are pumped, I'm pumped and Athur Ashe is certainly pumped!
*Nadal 6-7 (3-7) 0-1 Del Potro
Nadal saves one and another!
He roars with delight, fist pumps the air and bounds away with a look of furious determination.
Deuce.
*Nadal 6-7 (3-7) 0-1 Del Potro
The rallies just keep coming! Nadal's backhand across court is picked out mid-air by Del Potro and volleyed into the space to set up two break points!
*Nadal 6-7 (3-7) 0-1 Del Potro
Unreal tennis!
Nadal hammers forehand after forehand but Del Potro gives them straight back his way. The Spaniard adds depth to push his opponent deep but Del Potro unleashes an insane forehand winner!
WOW.
#bbctennis
James M: Del Potro will win the tournament. Been the best player so far by a mile. Djokovic has played mediocre opponents so far and has struggled to cope with the humidity at times.
*Nadal 6-7 (3-7) 0-1 Del Potro
Delpo takes the advantage and slots a delightful drop shot over the net to hold serve.
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Nadal 6-7 (3-7) 0-0 Del Potro*
The second set kicks off in the exact same manner as the first. A long rally ends in a backhand winner from Del Potro to go 30-0 up.
But Nadal returns a 112 mph serve with even more pace to close in on 40-30. And he draws up another deuce immediately afterwards.
Jeff Tarango
Former professional tennis player on BBC Radio 5 live sports extra
I am pumped. That first set was quite a set of tennis.
Del Potro kind of choked then pulled it out to take it.
The crowd is really loud and into it. There's great energy out there.
I think Nadal deserved the first set but Delpo got it. It's still 50-50.
Longest rally of that opening set? 22 shots.
The players are getting up off their seats now. Here we go then.
It's times like this that I wish I actually enjoyed coffee. Get your PJs on. We're going to be here all night if that first set is anything to go by.
One hour and 11 minutes was the length of that first set. That is five minutes longer than Serena Williams' semi-final victory over Anastasija Sevastova yesterday...
Chanda Rubin
American former world number six at Flushing Meadows
What tremendous resilience from Juan Martin del Potro. You could see the frustration when he failed to serve it out but he got right back to it.
Nadal 6-6 (3-7) Del Potro
Nadal's backhand flies into the net.
FIST PUMP! Del Potro has won the first set.
Nadal 6-6 (3-6) Del Potro*
Del Potro pushes Nadal out wide but the Spaniard somehow manages to return a cross-court forehand.
The Argentine squeezes it into play but Nadal's whipped forehand is wide. Three set points for Del Potro on his serve!
*Nadal 6-6 (3-5) Del Potro
Nadal smashes a serve down the T. Del Potro makes contact but it's nonreturnable.
Chanda Rubin
American former world number six at Flushing Meadows
Del Potro has found his forehand again and that has been the big difference in this tie-break.