Murray 7-5 7-6 (8-6) 3-6 4-6 5-2 Nishikori*published at 17:59
Nishikori into the net! Two match points!
Great Britain beat Japan 3-1 in Birmingham
Andy Murray beats Kei Nishikori 7-5 7-6 (8-6) 3-6 4-6 6-3
GB will play Serbia or Kazakhstan in July's quarter-final
Stephan Shemilt
Nishikori into the net! Two match points!
Some luck for Murray. A bounce off the top of the net leaves Nishikori with nowhere to go. Murray puts away with ease. 15-30...
#bbctennis
Now then, listen to the roar. Kei Nishikori must serve to stay in the match. "One more game," chants the crowd. Here we go...
John Lloyd
Former Davis Cup finalist on BBC Two
"This is one of the best matches I have ever seen to be honest. I have seen some great matches but this is up there."
Finally, finally Murray serves it out. Great Britain are one game away from the last eight of the Davis Cup.
It's quite brilliant from Nishikori, who pulls out the most outrageous drop shot at the most crucial of moments. Murray bangs the Nishikori backhand - surely that's not wise? - but, when the change comes, the Japanese is out of court. Game point, what a horrible time for Murray to produce a double fault.
Where has Nishikori found this from? It's like he comes to life after being broken. 0-30, then engaging Murray in an epic rally. The Scot comes forward and gets away with it, then an unreturnable gets it back to 30-30. Wide from Nishikori gives Murray a huge slice of luck after a mis-hit. Game point...
*Murray 7-5 7-6 (8-6) 3-6 4-6 4-2 Nishikori
What. A. Shot. Stand and deliver. Murray unloads on the return, down the line, Nishikori with no chance. Birmingham roars once more, Leon Smith puts a fist in the air. Surely now...
John Lloyd
Former Davis Cup finalist on BBC Two
"You are not going to find many better matches than this in the whole year, I guarantee you that."
The time? Nishikori wayward with a backhand. Another break point...
The tide has turned, but Murray just manages to cling on. Nishikori has the chance to put it away, but is long. On we go...
John Lloyd
Former Davis Cup finalist on BBC Two
"That is incredible. Murray was in charge the whole rally."
And another! It's incredible. Murray was in charge - why didn't he get into the net? When Nishikori had the chance to free his arms through a backhand, Murray was rooted to the spot.
It's incredible, it really is. These guys are wanting to do as little running as possible, so are dropping bombs. Nishikori saves one.
In case you're wondering, there will be a tie-break at the end of this set if we need it. Serving almost a hindrance now. Murray's legs get him to 0-30, while a wide Nishikori brings two more break points...
Andrew Castle
BBC Sport tennis commentator
"A future world number one? It is not hard to imagine that when Nishikori is playing like this."
Murray 7-5 7-6 (8-6) 3-6 4-6 3-2 Nishikori*
What more has this match got to throw at us? It's brilliant from Nishikori, who forces Murray top go long. This match twists and turns like a twisty-turny thing. Leon Smith has his head in his hand.
Ace! Murray saves one.
Murray goes to the well one more time, asking his serve to get him through. Leon Smith stands to applaud, but Nishikori isn't done yet. A thumping forehand has Murray flat-footed and brings two break points.