Postpublished at 21:28 British Summer Time 8 September
Sinner 6-3 6-4 5-5 Fritz*
Taylor Fritz cuts a hugely frustrated figure as what looks like a routine backhand return is long.
40-30.
LIVE: Jannik Sinner beats Taylor Fritz 6-3 6-4 7-5 to win US Open title
It is a second major of the year for world number one Sinner after winning Australian Open
Sinner is the first Italian man to win the singles title in New York
Fritz had been aiming to become first American man since Andy Roddick in 2003 to win a Grand Slam singles title
Fritz is already the first American man to reach a major singles final for 15 years
Live commentary available on BBC 5 Live using player at top of this page (UK only)
Bobbie Jackson and Marissa Thomas
Sinner 6-3 6-4 5-5 Fritz*
Taylor Fritz cuts a hugely frustrated figure as what looks like a routine backhand return is long.
40-30.
Sinner 6-3 6-4 5-5 Fritz*
The double faults continue to be an issue for Jannik Sinner.
30-30.
Sinner 6-3 6-4 5-5 Fritz*
Jannik Sinner keeps that momentum going.
30-0.
*Sinner 6-3 6-4 5-5 Fritz
You can't take your eyes off this.
Jannik Sinner with the drop shot and Taylor Fritz returns into the net.
*Sinner 6-3 6-4 4-5 Fritz
It's long from Taylor Fritz.
He's up against it here.
30-40.
*Sinner 6-3 6-4 4-5 Fritz
Jannik Sinner's backhand lets him down.
30-30.
This is tense.
*Sinner 6-3 6-4 4-5 Fritz
Jannik Sinner needs the break if he wants to wrap this match up in three sets.
The Italian comes out on top in a 14-shot rally.
15-30.
*Sinner 6-3 6-4 4-5 Fritz
Beautiful tennis from Taylor Fritz.
The American with a deft drop shot and Jannik Sinner returns into the net.
15-15.
*Sinner 6-3 6-4 4-5 Fritz
Taylor Fritz goes wide with his forehand.
0-15.
* denotes next server.
Sinner 6-3 6-4 4-5 Fritz*
Taylor Fritz's forehand down the line is long.
It's a hold to 15.
Taylor Fritz to serve for the set.
Sinner 6-3 6-4 3-5 Fritz*
Until the double fault strikes again.
That's Jannik Sinner's fourth in the match and third in this set.
30-15.
Sinner 6-3 6-4 3-5 Fritz*
Just the start that Jannik Sinner would have hoped for.
30-0.
*Sinner 6-3 6-4 3-5 Fritz
Annabel Croft
Former British number one on BBC Radio 5 Live and BBC Sounds
There's no question that Jannik Sinner has hit a little bit of a lull.
We're seeing more errors out of his racquet and the energy has gone down a little bit.
Maybe the nerves have kicked in.
*Sinner 6-3 6-4 3-5 Fritz
It was harder work than it needed to be but Taylor Frtiz gets it done with his 10th ace of the match.
Jannik Sinner will serve to stay in the set.
*Sinner 6-3 6-4 3-4 Fritz
This looked so promising for Taylor Fritz at 40-15 but he shanks a forehand and it's deuce.
*Sinner 6-3 6-4 3-4 Fritz
A second double fault in this game.
40-30.
*Sinner 6-3 6-4 3-4 Fritz
A decent recovery, though, with Taylor Fritz opting to turn up the aggression.
40-15.
*Sinner 6-3 6-4 3-4 Fritz
Now, can Taylor Fritz back up that break?
It's not a great start... a double fault.
0-15.
Sinner 6-3 6-4 3-4 Fritz*
Jeff Tarango
Former American tennis player on BBC Radio 5 Live and BBC Sounds
Taylor Fritz needs to get back into the match, one point at a time with great tennis like that.
Sinner 6-3 6-4 3-4 Fritz*
Laura Scott
BBC sports news correspondent in New York
Oh no, wait, those cheers are quickly surpassed as Fritz finally sets this match alight after nearly two hours.
Huge roars as he breaks the Sinner serve to lead 4-3. Could the comeback be on?