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
Norrie 6-6 (6-6) Tursunov
Has somebody superglued Cameron Norrie and Dmitry Tursunov together? They can't be separated. They are level at 6-6 in a first set minus any break points and now they are tied at 6-6 in the breaker. Hanging in the balance.
Edmund 6-3 3-3 Haase*
Ah. Sorry Kyle. Edmund faces a break point for the first time - seconds after we told you he hadn't faced one yet. The world number 42 responds with a corker of an ace down the middle, but then has to see off another break point before hanging onto his serve.
Gutsy from Edmund, frustrating for Haase.
*Watson 4-6 0-2 Cornet
Can Watson fight back at the start of the second set? Well, it could hardly have started any worse as Cornet again breaks in the opening game of the set before a love hold featuring four unforced errors from the Brit. Looking ominous.
Image source, Getty ImagesEdmund 6-3 2-3 Haase*
Talking of holding serve... that is what is continuing to happen over on court 10. Kyle Edmund is the next to attempt this as he looks to level at 3-3 in the second set. So far Robin Haase, the 32nd seed, has not managed to rack up a break point...
Norrie 6-6 Tursunov
Here's the answer to that question posed a couple of minutes ago... yes. Cameron Norrie holds his serve - and his nerve - to hold off a set point and take the opening set into a sudden-death decider. It's tie-break time!
Watson 4-6 Cornet
Piers Newbery
BBC Sport at Flushing Meadows
Despite her successful grass-court season, confidence still appears in short supply for Watson on America's hard courts. Her forehand has been especially wayward and Cornet is thriving off the Briton's errors.
Super-coach Patrick Mouratoglou is among those watching from a crowded courtside, videoing Cornet on his phone. Some technical analysis is no doubt being prepared for the Frenchwoman.
"They like the British girl here!" says a spectator.
"They don't like Cornet," responds her friend. Bit harsh.
Image source, AFP*Watson 4-6 Cornet
"Come on!" screams Heather Watson and she smashes a winner to get to 15-30 on the cornet serve but a feeble backhand follows. Cornet gets fortunate with a net cord to bring up her fourth set point and she finally seals the deal when a stretching Watson can't keep a forehand in court.
*Norrie 5-6 Tursunov
What of Cameron Norrie, I hear you cry. His opening set against Russian Dmitry Tursunov, who you may remember beat Tim Henman at Wimbledon in 2005, is still going on.
And that, I'd suggest, is only a good thing. Can the South African-born, Kiwi-raised, American-educated, Brit serve out to take this into a tie-break?
Piers Newbery
BBC Sport at Flushing Meadows
New York is being thoroughly outdone by the UK with temperatures here expected to peak at a paltry 24C - a cool breeze and cloud cover replacing the usual thumping humidity at Flushing Meadows this morning, although it's brightened up as play gets under way.
Hopefully, that should mean far fewer tales of cramping and withdrawals, and we can concentrate on the tennis, Speaking of which, those in the know tell us that the outside courts are lightning fast with a low bounce, while the freshly relayed Arthur Ashe Stadium is more of a slow high-bouncer. It could be like playing in different tournaments.
Edmund 6-3 1-1 Haase*
Kyle Edmund's serve has been as solid as a rock. No drama as the Briton levels up early in this second set, again not letting Robin Haase anywhere near a break point.
Image source, EPAWatson 4-5 Cornet*
Slice and dice from both players but Watson goes long. Cornet then pounces on a short second serve to bring up set point. Saved when Cornet sends a return into the net. The same again on the next point. A double fault brings it back to deuce and the Brit reacts with some fruity language. Another long forehand hands Cornet a second set point and Watson considers obliterating her racquet. Instead she goes on the offensive and saves it with a fine backhand. A return winner sets up a third set point but Cornet is again denied as she goes long. Another wild forehand from the Frenchwoman and Watson wriggles free. A turning point? Cornet to serve for the set...
Image source, Getty Images*Edmund 6-3 0-1 Haase
Nor is there a dress code on the court. Which is just as well for Kyle Edmund...
Image source, EPA
David Law
Radio 5 live sports extra commentator at Flushing Meadows
No specific dress code at the US Open. These fans are supporting Misa Eguchi on court five.
Image source, BBC Sport*Watson 3-5 Cornet
Alize Cornet holds again and no margin for Heather Watson here as she serves to stay in the first set.
Edmund 6-3 Haase
Cracking start. Kyle Edmund needs three bites of the cherry (or should that be Big Apple?) to wrap up the opening set.
The British number two sees a little bit of tightness creep in as he makes two rare unforced errors, but composes himself beautifully to hammer down a forehand winner for the set.
Haase raies his racket, he thinks it is long. Hawk-eye proves otherwise.
Watson 2-4 Cornet*
An opening for Watson at 0-30 but she can't capitalise, failing to put away a volley that would have brought up two break points. Cornet wriggles free, although Watson is unhappy when her forehand is called long - she things the call is too late. With no Hawkeye on court four, she can't challenge.
*Edmund 5-3 Haase
Kyle Edmund is known for his ball-bruising forehands, but his sliced backhand sets up a chance of a break. That puts him 30-0 ahead on Robin Haase's serve, the Dutchman panicking into a risky drop shot which the Brit swats away for 40-0. Three break points...
Haas saves one with a forehand winner. Then he saves another with an ace.
But he can't save the third. Haas clumps a forehand long and gives Edmund the chance of serving for the opening set...
Good starts for both Wimbledon champion Garbine Muguruza and Petra Kvitova. Muguruza is 4-0 up on American Varvara Lepchenko on Arthur Ashe Stadium while Czech Kvitova leads 2008 finalist Jelena Jankovic 5-2 on Louis Armstrong.
Image source, EPAEdmund 4-3 Haase*
Kyle Edmund arriving late in New York ahead of the tournament might not sound like the best preparation. But it was...
That's because the British number two was delayed as a result of his semi-final appearance in Winston Salem - his second semi-final of the US hard-court season.
Good omens for Flushing Meadows? The young Yorkshireman will be aiming to replicate his run to the fourth round last year.
Little to choose between him and Robin Haase so far.
Image source, EPA*Edmund 3-3 Haase
Robin Haase is unsettled by crowd noise as he aims to serve out and move back level in this opening set.
Somebody has forgotten to flick their phone onto 'Do Not Disturb' mode as they receive incoming call, then Haase has to pause at when he hears someone causing a commotion just behind him.
He crashes down an ace to level for 40-15, then allows Edmund to force deuce before sticking his foot on the accelerator again to level.