Good evening and welcome to our live text coverage of the first men's US Open semi-final as fifth seed Alexander Zverev takes on Pablo Carreno Busta on Arthur Ashe Stadium.

ZVEREV 3-6 2-6 6-3 6-4 6-3 CARRENO BUSTA - VICTORY FOR ZVEREV! What a comeback triumph for Alexander Zverev, who reaches his first Grand Slam final after recovering from two sets down. It's a crushing defeat for Pablo Carreno Busta, who looked in total control earlier, but Zverev found a way back.

ZVEREV 3-6 2-6 6-3 6-4 5-3 CARRENO BUSTA - Zverev looks set to reach his first Grand Slam final as he draws to within one game of a place in Sunday's showpiece. Can he close it out?

ZVEREV 3-6 2-6 6-3 6-4 4-3 CARRENO BUSTA - This match continues to drag on and it is far from entertaining. Carreno Busta again narrows the deficit and he remains in it.

ZVEREV 3-6 2-6 6-3 6-4 4-2 CARRENO BUSTA - Zverev, as he does every single game, fires a big serve down the T to begin, and Carreno Busta cannot find a response as his opponent holds to edge closer to victory.

ZVEREV 3-6 2-6 6-3 6-4 3-2 CARRENO BUSTA - It's an underwhelming hold from Carreno Busta, but he is still managing to hang in there somehow.

ZVEREV 3-6 2-6 6-3 6-4 3-1 CARRENO BUSTA - Zverev's serve has gone from truly woeful in the opening two sets to pretty solid and impressive and he holds once more.

ZVEREV 3-6 2-6 6-3 6-4 2-1 CARRENO BUSTA - Carreno Busta is hanging around in this final set, but Zverev really should be putting away his opponent now, who is struggling with his back and looks very tired.

ZVEREV 3-6 2-6 6-3 6-4 2-0 CARRENO BUSTA - Zverev holds serve after a very long deuce and now he has a platform from which to kick on in this final set. He is the clear favourite.

ZVEREV 3-6 2-6 6-3 6-4 1-0 CARRENO BUSTA - BREAK! What a start to the final set for Zverev, who immediately breaks the struggling Spaniard after his lengthy physio treatment.

ZVEREV 3-6 2-6 6-3 6-4 CARRENO BUSTA - SET! This match isn't of the highest quality, but we are into a fifth set nonetheless. Zverev serves out for it with relative ease, and now Carreno Busta gets the physio out for a back issue.

ZVEREV 3-6 2-6 6-3 5-4 CARRENO BUSTA - Carreno Busta does manage to hold on and reduce the deficit in this fourth set, but he looks very resigned to losing it with Zverev now able to serve out.

ZVEREV 3-6 2-6 6-3 5-3 CARRENO BUSTA - Zverev, who looked so awful in the opening two sets, has really turned this around and it looks like we will be treated to a fifth set on Arthur Ashe Stadium.

ZVEREV 3-6 2-6 6-3 4-3 CARRENO BUSTA - BREAK! Zverev hits straight back with a break, and he is in control of this set once more. Now, can he make it count and take this match all the way?

ZVEREV 3-6 2-6 6-3 3-3 CARRENO BUSTA - BREAK! This is why Carreno Busta just had to hang in there as Zverev falters on serve and hands the break back to the Spaniard. We're back on terms in the fourth set.

ZVEREV 3-6 2-6 6-3 3-2 CARRENO BUSTA - The Spaniard holds to reduce the deficit, and he has to stay with Zverev now as the German has not looked reliable on serve at all.

ZVEREV 3-6 2-6 6-3 3-1 CARRENO BUSTA - Zverev consolidates his break of serve, and now he has a clear advantage in this fourth set. Can Carreno Busta respond?

ZVEREV 3-6 2-6 6-3 2-1 CARRENO BUSTA - BREAK! Zverev breaks serve after a long deuce, and suddenly he now has the advantage in the fourth set too. This match could go the distance.