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Andy Murray beats Japan's Yoshihito Nishioka 4-6 4-6 7-6 (7-5) 7-6 (7-4) 6-4 in first round
Johanna Konta beats Heather Watson 7-6 (9-7) 6-1 in all-British tie
Dan Evans beats Brazilian youngster Thiago Seyboth Wild 6-2 6-1 7-6 (7-5)
Serena Williams starts bid for record-equalling 24th Grand Slam title with victory over Kristie Ahn
All matches played in bio-secure bubble at Flushing Meadows in New York
*Murray 4-6 4-6 7-6 (7-5) 2-3 Nishioka
Murray having to try to fend off two break points. He is successful with the first. 30-40.
Then a lob from Nishioka to try to get the advantage and a break. Nope. Long. Deuce.
*Murray 4-6 4-6 7-6 (7-5) 2-3 Nishioka
A backhand down the line winner from Nishioka sets the alarm bells ringing in the Murray camp. 0-30.
*Murray 4-6 4-6 7-6 (7-5) 2-3 Nishioka
A hold to love for Murray, followed by a hold to love for Nishioka. Saving themselves for the final push at the business end of the fourth set.
Murray 4-6 4-6 7-6 (7-5) 2-2 Nishioka*
His first service game of the set went on for ages, Murray's second is a much needed recharging hold to love. Next!
Watson 6-7 (7-9) 0-4 Konta*
Watson was so impressive in the first set but it looks like Konta could soon wrap this up now.
A delightful forehand lob seals a second break for the British number one.
*Murray 4-6 4-6 7-6 (7-5) 1-2 Nishioka
Naomi Broady
British player on BBC Radio 5 Live
Every time I think this match is going to swing one way it doesn't and goes completely in the opposite direction instead.
*Murray 4-6 4-6 7-6 (7-5) 1-2 Nishioka
Murray is the one expending the most energy. His service games are a battle, Nishioka takes cares of his with relative ease.
Murray 4-6 4-6 7-6 (7-5) 1-1 Nishioka*
That is one excellent hold as Nishioka threatened to put his foot down on the accelerator again. But Murray digs deep to slow him down and we stay on serve after a mammoth game. 1-1, fourth set.
*Murray 4-6 4-6 7-6 (7-5) 0-1 Nishioka
A cross-court winner from Murray saves another break point. In so many games today, Murray has had to work so hard to hold his serve. Back to deuce once more.
Another double fault from Murray = another break point chance for Nishioka.
*Murray 4-6 4-6 7-6 (7-5) 0-1 Nishioka
An overhead smash from Murray gets rid of that Nishioka break point. We started the match with a long game on the Murray serve and that's what we've got again.
Break point Nishioka.
*Murray 4-6 4-6 7-6 (7-5) 0-1 Nishioka
We're at the three-hour mark. Get comfortable we could be here a lot longer.
*Murray 4-6 4-6 7-6 (7-5) 0-1 Nishioka
It's a mixed bag this service game from Murray - a double fault and then an ace shortly after. Deuce.
*Murray 4-6 4-6 7-6 (7-5) 0-1 Nishioka
A lovely forehand volley after some aggression from the baseline. Andy Murray seems revitalised after edging that tie-break. 30-30
Watson 6-7 (7-9) 0-2 Konta*
After a straightforward hold for Konta, it looked as though Watson was going to do the same.
But early drama in the second set as a double fault gave Konta break point. Watson gave her compatriot a further helping hand, slicing a backhand into the net to give Konta a 2-0 lead.
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*Murray 4-6 4-6 7-6 (7-5) 0-1 Nishioka
Nishioka is serving at the start of the fourth set and it goes to deuce, but he claims the next two points, sealing the game with a fine serve that Murray can just about get his racquet to, but can't steer it back into play.
Murray 4-6 4-6 7-6 (7-5) 0-0 Nishioka*
How good is it to see Andy Murray in a Grand Slam and fighting hard?
Set four incoming.
Murray 4-6 4-6 7-6 (7-5) Nishioka
Naomi Broady
British player on BBC Radio 5 Live Sports Extra
He has dug in. Andy's first serve percentage has just crept over 50% for the first time in the match and his unforced error count is high, but it shows how hard he is scrapping to fight back when his level isn't that high.