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Stefanos Tsitsipas beats Andy Murray 6-2 6-7 (7-9) 6-3 3-6 6-4 on Arthur Ashe in first round
British number one Dan Evans beats Brazil's Thiago Monteiro 6-3 6-7 (6-8) 6-4 6-1
Britain's Heather Watson and Harriet Dart make first-round exits
British number one Johanna Konta pulls out of tournament hours before her scheduled first-round match
Later: Cameron Norrie v Spain's Carlos Alcaraz
*Murray 6-2 6-7 (7-9) 6-3 0-3 Tsitsipas
Another double fault and a miss by Tsitsipas and suddenly Murray is at deuce with a chance to fight for an immediate response.
It's not to be, however, as Tsitsipas consolidates his lead with a forehand winner.
Murray 6-2 6-7 (7-9) 6-3 0-2 Tsitsipas*
Murray is playing with his shoes in between points. Hopefully they're not distracting him too much...
A double fault by Tsitsipas gets Murray involved at 30-15, but the Greek volleys to move within one point of a 3-0 lead.
Laura Robson
Former British number one on BBC Radio 5 Live Sports Extra
Apparently Andy said to his team to message Dan Evans about his shoes.
I don't understand how he's able to help here. They're very different heights, very different shoe size, very different sponsors...
Murray 6-2 6-7 (7-9) 6-3 0-2 Tsitsipas*
From 40-0 down, Tsitsipas forces a break point with a forehand winner.
And he gets it! Murray misses with a wide forehand and it's advantage Tsitsipas in set four.
Image source, EPA#bbctennis
Helen B: Sorry to distract from Murray's great performance but why, just why, is Tsitsipas wearing dark underpants under white shorts? He deserves to lose!
Georgie Heath: Andy Murray proving that in the right pair of shoes anything is possible.
Ellen Marshall: I really have to get ready for work here in Sydney but I can’t look away from Murray / Tsitsipas…. Andy 2 sets to 1 up!! Unbelievable!! What an incredible effort
*Murray 6-2 6-7 (7-9) 6-3 0-1 Tsitsipas
A forehand winner puts Murray in firm control on serve at 40-0.
Tsitsipas battles back though, and the Greek forces deuce after Murray fails to lift a backhand over the net.
*Murray 6-2 6-7 (7-9) 6-3 0-1 Tsitsipas
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Laura Robson
Former British number one on BBC Radio 5 Live Sports Extra
I don't really know what I would change if I was Tsitsipas.
He's not played a bad match at all. It's just Andy that's played fantastic.
He's almost just got to wait for Andy's level to drop.
Kerber 3-6 6-4 7-6 (7-3) Yastremska
Sixteenth seed Angelique Kerber was made to work for her victory against Ukraine's Dayana Yastremska.
Yastremska took the first set but Kerber fought her way back to seal her place in the second round.
Coco Gauff - seeded 21st - is having a similarly slow start. She lost the first set 7-5 to Poland's Magda Linette and is a break down at 2-1 in the second.
*Murray 6-2 6-7 (7-9) 6-3 0-1 Tsitsipas
A double fault brings Murray to 40-30, but he hits long from the baseline as Tsitsipas takes the opening game of the fourth set.
Murray 6-2 6-7 (7-9) 6-3 0-0 Tsitsipas*
It's Murray who gets on the board first, but Tsitsipas turns things around with an ace before landing a stunning inch-perfect drop shot for 40-15.
Murray 6-2 6-7 (7-9) 6-3 0-0 Tsitsipas*
Tsitsipas received some medical attention for a foot issue by the side of the court as the players took a well-earned break before the fourth set.
The third seed is good to go again and will serve first in this must-win set.
Russell Fuller
Tennis commentator on BBC Radio 5 Live Sports Extra
I thought Andy Murray could still win big matches but I didn't think he could play with such fluidity, elegance, power and nimbleness around the court.
It's all come together in one night.
#bbctennis
Return of the Mark: Murray is probably my favourite British sportsman of the last 20 years, but I’ve never enjoyed watching him play.
Sukh Pabial: Love to see it! He's playing so well. Neither player will have wanted a first-round match like this. Three hours and three sets is gruelling athleticism.
Theo: Murray magic right now! Oh how good for the soul to see him back playing at this level
Laura Robson
Former British number one on BBC Radio 5 Live Sports Extra
You might think Andy Murray had won the match with that reaction.
He has just been so good tonight. When he has needed to raise his level he has.
Tsitsipas is number three in the world, absolutely by far the favourite in this match. I can't believe it.
David Law
Commentator on BBC Radio 5 Live Sports Extra
Murray's instincts tonight have been absolutely spot on.
If he has seen Tsitsipas off balance for a second, he has been on him.
Murray 6-2 6-7 (7-9) 6-3 0-0 Tsitsipas*
Brilliant. Just brilliant.
Andy Murray sends a forehand winner down the line to claim the third set against Stefanos Tsitsipas.
What a performance this is.
*Murray 6-2 6-7 (7-9) 5-3 Tsitsipas
It's a huge if, Joshua, but if so he would be a match for anyone.
Tsitsipas moves to 30-15 but that's a sensational reply from Murray, who buries a rocket of a forehand to draw level.
#bbctennis
Joshua Byers Warner: If Andy is able to sustain this level of play throughout the tournament good luck to the rest of the field because none will get near him other then Novak.
Laura Robson
Former British number one on BBC Radio 5 Live Sports Extra
This is when Andy wants more energy from the crowd just to close out set three.
He is so fired up after every single point that he wins. It is great to see.