Fritz holdspublished at 20:25 British Summer Time 8 September
*Sinner 6-3 4-4 Fritz
Taylor Fritz certainly doesn't display any hesitation and it's a hold to 15.
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 4-4 Fritz
Taylor Fritz certainly doesn't display any hesitation and it's a hold to 15.
*Sinner 6-3 4-3 Fritz
This feels like a key moment in the second set.
If Taylor Fritz is broken then Jannik Sinner could soon find himself two sets up.
Fritz starts well.
30-0.
Sinner 6-3 4-3 Fritz*
This time it's a backhand from the baseline that lets Taylor Fritz down.
Sinner 6-3 4-3 Fritz*
Laura Scott
BBC sports news correspondent in New York
Following those chants and some of just “Taylor” (one assumes aimed at Fritz, not Swift), the American enjoys his most comfortable service game, holding to love and keeping it level in this second set.
He knows he can’t let the world number one get too much of an advantage in this match otherwise it could soon slip away quickly.
Sinner 6-3 3-3 Fritz*
A very cute and well disguised Jannik Sinner drop shot catches Taylor Fritz on his heels and the American is unable to return.
40-15.
Sinner 6-3 3-3 Fritz*
Taylor Fritz turns away in frustration as his forehand strays long.
30-15.
*Sinner 6-3 3-3 Fritz
The American doesn't look back from that positive start.
A hold to love.
Broken three times in the opening set but he's only dropped one point on serve in the second.
*Sinner 6-3 3-2 Fritz
A sixth ace of the match to get Taylor Fritz moving.
15-0.
Sinner 6-3 3-2 Fritz*
Jannik Sinner uses that chant as fuel of his own and sees out the game.
Sinner 6-3 3-2 Fritz*
Laura Scott
BBC sports news correspondent in New York
With Fritz down a set, it feels a little like the crowd need something to give them a boost - a sniff of a break, a blockbuster rally, or maybe just one big rousing chant of U-S-A.
Sinner 6-3 2-2 Fritz*
Taylor Fritz sends it wide.
30-15.
A chant of "let's go Taylor, let's go" ripples around Arthur Ashe.
Sinner 6-3 2-2 Fritz*
It's so satisfying to watch when a player gets a forehand down the line just right.
Hats off the Taylor Fritz for sneaking it just the right side of the line.
15-15.
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Dennis: Jannik Sinner is absolutely crushing this ball especially on his forehand. Fritz has done well to stay with him.
*Sinner 6-3 2-2 Fritz
Jeff Tarango
Former American tennis player on BBC Radio 5 Live and BBC Sounds
Taylor Fritz needs to get things going, he needs to move into fifth gear.
He's got to go for the break now.
*Sinner 6-3 2-2 Fritz
Jannik Sinner puts his forehand into the net and it's a hold to love in quick fashion.
*Sinner 6-3 2-1 Fritz
That's more like it from Taylor Fritz.
He's really finding his rhythm on first serve and rattling through the points.
40-0.
Sinner 6-3 2-1 Fritz*
Taylor Fritz's backhand lets him down this time.
Sinner 6-3 1-1 Fritz*
A 116mph ace from Jannik Sinner puts him on the verge of holding.
40-30.
Sinner 6-3 1-1 Fritz*
Jeff Tarango
Former American tennis player on BBC Radio 5 Live and BBC Sounds
Taylor Fritz is asking a lot of questions and they are more out of panic than anything else.
He's got to serve fantastically, he needs to get into the net more, he needs to use his slice more.
Sinner 6-3 1-1 Fritz*
Taylor Fritz's backhand is doing plenty of damage when he leans on it.
15-30.