You couldn't have asked for a more epic encounter than that.
Sharapova into round two, beating the world number two in her first Grand Slam in 19 months and the women's draw is wide open.
I'm off to sleep, but we have plenty on offer on day two.
Defending women's singles champion Angelique Kerber is in action alongside men's world number one Rafael Nadal, while Roger Federer features in the evening session.
You can read the report of Sharapova's win here. We'll see you later today!
Post update
Asked about how she's managed to accumulate an 18-0 win record on Arthur Ashe Stadium in night matches, Sharapova adds: "It's primetime, baby. I love it."
'This girl is not going anywhere'
Sharapova 6-4 4-6 6-3 Halep
Maria Sharapova: "I thought this was another day, another match, but this was so much more, you never know what you will feel until you win match point.
"You sometimes wonder why you put in all the work and this is why.
"We respect each other so much, the hype was because of the quality of the matches we have played before.
"These are the opportunities you play for. Behind all these Swarovski crystal and dresses, this girl has a lot of grit and she is not gong anywhere."
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You'd think she'd won the final.
Sharapova in tears
Sharapova 6-4 4-6 6-3 Halep
Sharapova drops to her knees, she then stands up and takes the applause on the Arthur Ashe court, she is overcome with emotion.
The comeback is on.
Halep walks straight off.
Sharapova sits in her chair, sobbing.
Game, set and match Sharapova
Sharapova 6-4 4-6 6-3 Halep
Halep goes long, Sharapova has done it.
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Match point
*Sharapova 6-4 4-6 5-3 Halep
Match point for Sharapova, the crowd are on their feet.
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Sharapova saves break point
*Sharapova 6-4 4-6 5-3 Halep
Halep nets a return. Deuce.
Break point for Halep
*Sharapova 6-4 4-6 5-3 Halep
Too good from Halep, she goes down the line and Sharapova can't reach it.
Big reaction from the world number two.
Break point.
Post update
*Sharapova 6-4 4-6 5-3 Halep
30-30 as Sharapova sends a backhand winner down the line.
Two points away.
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*Sharapova 6-4 4-6 5-3 Halep
Halep sent running as she can only return into the net. 15-30.
The Romanian looks in a bit of discomfort out there.
Post update
*Sharapova 6-4 4-6 5-3 Halep
Double fault by Sharapova. 0-30. We've been here before.
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*Sharapova 6-4 4-6 5-3 Halep
Halep wins the first point with a great backhand volley, 0-15.
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*Sharapova 6-4 4-6 5-3 Halep
Maria Sharapova to serve for a place and blow this women's draw apart.
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Russell Fuller
BBC tennis correspondent at Flushing Meadows
50-50 at best, I reckon, but I certainly wouldn't bet against Halep here.
Sharapova to serve for match
Sharapova 6-4 4-6 5-3 Halep*
Halep holds.
If Sharapova is to win this game she is going to have to serve it out herself.
Sharapova a game away from the match
Sharapova 6-4 4-6 5-2 Halep*
Sharapova's serve is on fire, Halep is not getting a look in.
When she does, Maria's groundstrokes are starting to look a bit lethargic.
A huge ace out wide wins the game.
One game away now.
Post update
Almost two and a half hours played now.
Post update
*Sharapova 6-4 4-6 4-2 Halep
Simple hold for Halep.
Post update
Sharapova 6-4 4-6 4-1 Halep*
Sharapova holds again, her last point ricocheting of the top of the net and landing on Halep's side of the court.
Two games away now for Sharapova.
Halep sits in her chair at the changeover, looking for some inspiration.
Live Reporting
Matt Davis
All times stated are UK
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Getty ImagesCopyright: Getty Images 
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Getty ImagesCopyright: Getty Images
Latest PostPost update
How about that for day one.
You couldn't have asked for a more epic encounter than that.
Sharapova into round two, beating the world number two in her first Grand Slam in 19 months and the women's draw is wide open.
I'm off to sleep, but we have plenty on offer on day two.
Defending women's singles champion Angelique Kerber is in action alongside men's world number one Rafael Nadal, while Roger Federer features in the evening session.
You can read the report of Sharapova's win here. We'll see you later today!
Post update
Asked about how she's managed to accumulate an 18-0 win record on Arthur Ashe Stadium in night matches, Sharapova adds: "It's primetime, baby. I love it."
'This girl is not going anywhere'
Sharapova 6-4 4-6 6-3 Halep
Maria Sharapova: "I thought this was another day, another match, but this was so much more, you never know what you will feel until you win match point.
"You sometimes wonder why you put in all the work and this is why.
"We respect each other so much, the hype was because of the quality of the matches we have played before.
"These are the opportunities you play for. Behind all these Swarovski crystal and dresses, this girl has a lot of grit and she is not gong anywhere."
Post update
You'd think she'd won the final.
Sharapova in tears
Sharapova 6-4 4-6 6-3 Halep
Sharapova drops to her knees, she then stands up and takes the applause on the Arthur Ashe court, she is overcome with emotion.
The comeback is on.
Halep walks straight off.
Sharapova sits in her chair, sobbing.
Game, set and match Sharapova
Sharapova 6-4 4-6 6-3 Halep
Halep goes long, Sharapova has done it.
Match point
*Sharapova 6-4 4-6 5-3 Halep
Match point for Sharapova, the crowd are on their feet.
Sharapova saves break point
*Sharapova 6-4 4-6 5-3 Halep
Halep nets a return. Deuce.
Break point for Halep
*Sharapova 6-4 4-6 5-3 Halep
Too good from Halep, she goes down the line and Sharapova can't reach it.
Big reaction from the world number two.
Break point.
Post update
*Sharapova 6-4 4-6 5-3 Halep
30-30 as Sharapova sends a backhand winner down the line.
Two points away.
Post update
*Sharapova 6-4 4-6 5-3 Halep
Halep sent running as she can only return into the net. 15-30.
The Romanian looks in a bit of discomfort out there.
Post update
*Sharapova 6-4 4-6 5-3 Halep
Double fault by Sharapova. 0-30. We've been here before.
Post update
*Sharapova 6-4 4-6 5-3 Halep
Halep wins the first point with a great backhand volley, 0-15.
Post update
*Sharapova 6-4 4-6 5-3 Halep
Maria Sharapova to serve for a place and blow this women's draw apart.
Post update
Russell Fuller
BBC tennis correspondent at Flushing Meadows
50-50 at best, I reckon, but I certainly wouldn't bet against Halep here.
Sharapova to serve for match
Sharapova 6-4 4-6 5-3 Halep*
Halep holds.
If Sharapova is to win this game she is going to have to serve it out herself.
Sharapova a game away from the match
Sharapova 6-4 4-6 5-2 Halep*
Sharapova's serve is on fire, Halep is not getting a look in.
When she does, Maria's groundstrokes are starting to look a bit lethargic.
A huge ace out wide wins the game.
One game away now.
Post update
Almost two and a half hours played now.
Post update
*Sharapova 6-4 4-6 4-2 Halep
Simple hold for Halep.
Post update
Sharapova 6-4 4-6 4-1 Halep*
Sharapova holds again, her last point ricocheting of the top of the net and landing on Halep's side of the court.
Two games away now for Sharapova.
Halep sits in her chair at the changeover, looking for some inspiration.