Wildcard Sharapova beats world number two Halep 6-4 4-6 6-3 in 2hrs & 44mins
First Grand Slam match for Sharapova since 15-month ban
GB's Konta beaten 4-6 6-3 6-4 by world number 78 Krunic
Edmund beats 32nd seed Haase 6-3 7-5 6-3
Qualifier Norrie through after Tursunov retires when trailing 7-6 (9-7) 6-1
Watson loses 6-4 6-4 to Cornet; Venus, Muguruza & Kvitova through
Konta 1-1 Krunic*
Jo Konta gets of the mark without too much fuss, starting with an ace and a forehand winner. The seventh seed is left flat-footed by a baseline return from Krunic, which lands inside the line near her right trainer, for 30-15 before Konta sees out the hold.
Image source, AFP*Konta 0-1 Krunic
Early nerves are apparent as Krunic produces an early double fault, although the Serb recovers well to hold when Konta whacks a cross-court backhand into the tramlines.
There are a couple of moments in the opener where the Brit, including the game-winning point, is left flummoxed by the height of the ball bounce. It kicks up like a bouncy ball on a school playground.
Naomi Broady
British number three on BBC Radio 5 live sports extra at Flushing Meadows
Krunic makes an incredible amount of balls, she's very, very quick. It's interesting that she and Novak Djokovic are both Serbs because they move in a similar manner.
Konta 0-0 Krunic*
Here we go then. Interestingly Jo Konta won the toss but elected to receive first. She clearly wants to get all over the diminutive Serb's serve from the first ball.
*denotes next server
#bbctennis
Feeling like you are talking to yourself can be quite boring. So let's have some interaction. Is Flushing Meadows going to be where Johanna Konta wins her first Grand Slam? If so, why? And if not, who are you backing?
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Piers Newbery
BBC Sport at Flushing Meadows
Image source, BBC SportThe locals have just seen American Steve Johnson win on Grandstand Court, which explains the smattering of spectators as the players knock up and the enormous snaking queue for coffee outside. It's still cool, still a little blustery, but the high stands of this relatively new show court mean conditions should be calm enough. Ed Sheeran booms out across the stadium, inevitably, and Britain's number one is ready to start what she expects to be "a battle".
Konta v Krunic
There are more empty blue seats in the Grandstand court than there are people as Jo Konta arrives on court. But those who are there give the Briton a rousing reception.
Konta has never played Aleksandra Krunic, who is ranked 78th in the world.
Don't forget you can also tune into BBC Radio 5 live sports extra for live commentary.
Jo Konta is hoping to follow a couple of other big names in reaching the second round without much fuss.
Garbine Muguruza and Petra Kvitova, who both know how to win a Grand Slam, are already through today.
Muguruza, the reigning WImbledon champion, won 6-0 6-3 against American Varvara Lepchenko as she aims to progress past the third round at Flushing Meadows for the first time.
Meanwhile, Kvitova beat Serbia's former world number one Jelena Jankovic 7-5 7-5.
Image source, Getty ImagesNot only is Steve Johnson's win of interest to British tennis fans because it means Jo Konta will be in action shortly, but it also means we know the identity of Kyle Edmund's next opponent.
Another tough match for the British number two, although he knows he has got the beating of the American.
Edmund won in three sets against Johnson at Winston Salem last week.
Almagro 4-6 6-7 (2-7) 6-7 (5-7) Johnson
Steve Johnson can't take his first match point in the third set breaker, but makes no mistake with the second as he serves out for victory.
Johnson, ranked 46th in the world, broke down in tears at the French Open when he beat Borna Coric just weeks after the death of his father and coach Steve Snr and he looks emotional again as he celebrates victory in his home Slam.
Image source, EPAAlmagro 4-6 6-7 (2-7) 6-6 Johnson
Seventh seed Johanna Konta is due on Grandstand court after home player Steve Johnson's match against Spain's Nicolas Almagro is over. Johnson is currently two sets up and has a mini-break in the third set tie-break. So this could be over before you've had time to make a brew.
Konta v Krunic
Our tennis correspondent gives you a heads-up...
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David Law
Radio 5 live sports extra commentator at Flushing Meadows
Cameron Norrie nearly doubled his 2017 prize money with that win over Tursunov. Guaranteed $77,000. Doubles career prize money with another win.
Edmund 6-3 7-5 6-3 Haase
British number two Kyle Edmund, speaking to Eurosport, after his comfortable first-round win: "Last year I had no pressure because I was playing Richard Gasquet, today I was playing a seed but it was different. You want to do well yourself.
"I managed my game well. I would have liked to have been more solid, but I saved break points. Overall to come and win in three straight sets against a guy like Haase, I am pleased with it.
"I was very tired this morning, I have played a lot of matches, this is my eighth in 10 days. I woke up very tired. My coach said today is not about tactics, it's about mentality.
"I had to drink a can of cola to get my sugar up, but then I started to get into the match."
Piers Newbery
BBC Sport at Flushing Meadows
Cameron Norrie is not short of supporters after his maiden Grand Slam win, the recent alumnus of Texas Christian University spends several minutes posing with fans before greeting friends and family and doing a quick TV interview as he looks to escape Court 14. A huge day for the 22-year-old.
Image source, BBC SportEdmund 6-3 7-5 6-3 Haase
Next up for Kyle Edmund? Likely to be American Steve Johnson, who is two sets ahead against Spain's Nicolas Almagro.
Edmund 6-3 7-5 6-3 Haase
A great day's work. Kyle Edmund - the natural heir to Andy 'King of British Tennis' Murray's throne - opens his US Open campaign with a superb win.
The world number 42 doesn't even need a second hold as Robin Haase, the Dutch 32nd seed, coughs up another break in the match-winning game. Not only that, he doubles faults on match point.
Not Haase's day. But that was because Edmund was aggressive and always on the front foot.
Image source, Getty ImagesNorrie 7-6 (9-7) 6-1 Tursunov
British number five Cameron Norrie on his maiden Grand Slam win: "I was really nervous this morning so I just had to tough out the first set and I relaxed a bit in the second. I'm stoked to be through and in the second round.
"I knew I had been playing well, there were a lot of long rallies towards the end of that first set but I stuck to what I knew and sneaked over the line. Then I kept focused in the second set and unfortunately he had to retire with injury."
On how he will celebrate tonight: "I might have a couple of brews tonight to enjoy it! Nah, I'll stay focused and prepare for Wednesday.
Edmund 6-3 7-5 4-2 Haase*
One in, one out. Although Kyle Edmund looks odds-on to join Cameron Norrie in round two, not Heather Watson at Terminal Two at JFK.
Edmund is showing why he is rated as having one of the best forehands in the game, certainly outside of the top 10, by clobbering his 15th winner of the match on that wing on his way to a 4-2 lead.
Two more holds it is then.
Image source, Rex FeaturesWatson 4-6 4-6 Cornet
Heather Watson served seven double faults and her first serve percentage was only 47% in the match, making life far too easy for her opponent.
Alize Cornet is through to the second for the eighth time.
Image source, Rex Features