We'll be back tomorrow for the women's semi-finals.
Jelena Ostapenko plays Angelique Kerber and Serena Williams faces Julia Gorges.
I now give you permission to head here for extra time and penalties, if you can face it.
'A big achievement for me'
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Rafael Nadal after his win over Juan Martin Del Potro:
"I think it was great quality tennis,
the final set was there were some amazing points. Sorry to Juan Martin, an amazing opponent
and player. In some ways he deserves to go through too.
"Anything
could happen, so this is a big achievement for me to get to the semi-finals at
Wimbledon.
"The last set has a little of everything,
great points, great rallies, he was hitting crazy with his forehands. I tried
to resist, maintaining focus.
"Now
is the moment to enjoy but start to recover, it was a tough physical battle.
the opponent that is coming one of the toughest. I am just excited to be in the
semis. I need to recover to give my best.
And asked about England's on-going World Cup semi-final: "Maybe it's coming home, let's see. I
will watch the match now in the locker room."
Post update
Getty ImagesCopyright: Getty Images
Post update
So this year's men's Wimbledon semi-finals are as follows:
Kevin Anderson v John Isner
Rafael Nadal v Novak Djokovic
They'll both be played on Friday.
'Rafa's resilience saw him triumph'
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Tim Henman
Former British number one on BBC TV
It was such a great effort from Del Potro. After losing the first set we thought he would be up against it but he did well to get on level terms and then get his nose in front.
It was Rafa's resilience, his intensity to find a way to come out on top.
'I felt very lucky to watch that'
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Andy Murray
Two-time Wimbledon champion on BBC TV
It was a great match that got better and better. That fifth set one of the best sets I have ever seen.
Both played at such a high level, huge hitting and we saw great touch too. It was a great match and I felt very lucky to watch that,
Post update
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Rafael Nadal returns to the middle of the court and celebrates. He's back in the last four on the Wimbledon grass.
Del Potro slowly disappears. Nadal and the rest of Centre Court applaud him as he exits.
Game, set and match - Nadal
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
No one deserved to lose but Rafael Nadal is into the Wimbledon semi-finals again.
Del Potro falls flat on the court. Nadal hops over the net and the pair embrace.
A fitting finish with both players in each other's arms.
Getty ImagesCopyright: Getty Images
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Del Potro falters. Wide into the tram lines.
Match point Nadal.
Get Involved
#bbctennis or text 81111
Morgwn: I think Nadal and Del Potro are giving us one of, it not the best set of tennis ever. Unbelievable 5th set from both men. Incredible play. Each and every game is an epic in it's own right.
Emma: Everything I love about tennis is on display right now. My heart can’t take it. Come on Delpo!
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Another lasered forehand into the corner from DelPo.
30-30.
My heart...
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Nadal goes wide at the end of another marathon rally. Del Potro looks knackered but is still going.
30-15.
Getty ImagesCopyright: Getty Images
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
A framed forehead from Del Potro.
30-0.
Nadal is two points from victory.
'Del Potro has to go for it'
Nadal 7-5 6-7 (7-9) 4-6 6-4 5-3 Del Potro*
Andy Murray
Two-time Wimbledon champion on BBC TV
There's a choice for Del Potro to make. Does he go for it, take his chances with the forehand or put balls back in play and make Nadal work for it? Does he make Nadal think about it? I think he has to go for it.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
It is in.
15-0.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
A challenge from Nadal mid-point. This has to be in or he loses the point.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Juan Martin del Potro steps from his chair for possibly the last time. He's had chances in the last few games. Can he create another?
Rafa is serving for the semi-final.
Get Involved
#bbctennis or text 81111
Fiona: Absolutely
glued to this match between Rafael Nadal and Del Potro. Nail-biting stuff in
this final set. Fantastic tennis
Vlok: What a titanic game between Rafal Nadal and Del Porto at Wimbledon
Muhammad: World class break point saved by Nadal.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
An ace from Del Potro. Rafael Nadal will now serve for the match.
Post update
Nadal 7-5 6-7 (7-9) 4-6 6-4 5-3 Del Potro*
That's just stupid 107mph winner from Juan Martin del Potro. The noise it made off the racquet will have measured on the Richter Scale.
Live Reporting
By Alex Bysouth and Matthew Henry
All times stated are UK
Get involved
Post update
And that's that for today.
We'll be back tomorrow for the women's semi-finals.
Jelena Ostapenko plays Angelique Kerber and Serena Williams faces Julia Gorges.
I now give you permission to head here for extra time and penalties, if you can face it.
'A big achievement for me'
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Rafael Nadal after his win over Juan Martin Del Potro:
"I think it was great quality tennis, the final set was there were some amazing points. Sorry to Juan Martin, an amazing opponent and player. In some ways he deserves to go through too.
"Anything could happen, so this is a big achievement for me to get to the semi-finals at Wimbledon.
"The last set has a little of everything, great points, great rallies, he was hitting crazy with his forehands. I tried to resist, maintaining focus.
"Now is the moment to enjoy but start to recover, it was a tough physical battle. the opponent that is coming one of the toughest. I am just excited to be in the semis. I need to recover to give my best.
And asked about England's on-going World Cup semi-final: "Maybe it's coming home, let's see. I will watch the match now in the locker room."
Post update
Post update
So this year's men's Wimbledon semi-finals are as follows:
Kevin Anderson v John Isner
Rafael Nadal v Novak Djokovic
They'll both be played on Friday.
'Rafa's resilience saw him triumph'
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Tim Henman
Former British number one on BBC TV
It was such a great effort from Del Potro. After losing the first set we thought he would be up against it but he did well to get on level terms and then get his nose in front.
It was Rafa's resilience, his intensity to find a way to come out on top.
'I felt very lucky to watch that'
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Andy Murray
Two-time Wimbledon champion on BBC TV
It was a great match that got better and better. That fifth set one of the best sets I have ever seen.
Both played at such a high level, huge hitting and we saw great touch too. It was a great match and I felt very lucky to watch that,
Post update
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
Rafael Nadal returns to the middle of the court and celebrates. He's back in the last four on the Wimbledon grass.
Del Potro slowly disappears. Nadal and the rest of Centre Court applaud him as he exits.
Game, set and match - Nadal
Nadal 7-5 6-7 (7-9) 4-6 6-4 6-4 Del Potro
No one deserved to lose but Rafael Nadal is into the Wimbledon semi-finals again.
Del Potro falls flat on the court. Nadal hops over the net and the pair embrace.
A fitting finish with both players in each other's arms.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Del Potro falters. Wide into the tram lines.
Match point Nadal.
Get Involved
#bbctennis or text 81111
Morgwn: I think Nadal and Del Potro are giving us one of, it not the best set of tennis ever. Unbelievable 5th set from both men. Incredible play. Each and every game is an epic in it's own right.
Emma: Everything I love about tennis is on display right now. My heart can’t take it. Come on Delpo!
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Another lasered forehand into the corner from DelPo.
30-30.
My heart...
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Nadal goes wide at the end of another marathon rally. Del Potro looks knackered but is still going.
30-15.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
A framed forehead from Del Potro.
30-0.
Nadal is two points from victory.
'Del Potro has to go for it'
Nadal 7-5 6-7 (7-9) 4-6 6-4 5-3 Del Potro*
Andy Murray
Two-time Wimbledon champion on BBC TV
There's a choice for Del Potro to make. Does he go for it, take his chances with the forehand or put balls back in play and make Nadal work for it? Does he make Nadal think about it? I think he has to go for it.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
It is in.
15-0.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
A challenge from Nadal mid-point. This has to be in or he loses the point.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
Juan Martin del Potro steps from his chair for possibly the last time. He's had chances in the last few games. Can he create another?
Rafa is serving for the semi-final.
Get Involved
#bbctennis or text 81111
Fiona: Absolutely glued to this match between Rafael Nadal and Del Potro. Nail-biting stuff in this final set. Fantastic tennis
Vlok: What a titanic game between Rafal Nadal and Del Porto at Wimbledon
Muhammad: World class break point saved by Nadal.
Post update
*Nadal 7-5 6-7 (7-9) 4-6 6-4 5-4 Del Potro
An ace from Del Potro. Rafael Nadal will now serve for the match.
Post update
Nadal 7-5 6-7 (7-9) 4-6 6-4 5-3 Del Potro*
That's just stupid 107mph winner from Juan Martin del Potro. The noise it made off the racquet will have measured on the Richter Scale.
30-0.