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Wheelchair maestro Dylan Alcott has been left choked with emotion after becoming the first man in any form of tennis to earn the calendar year 'golden slam' of all four major titles and Paralympic or Olympic gold

The 30-year-old Melburnian looked close to tears as he admitted, after his emphatic 7-5 6-2 triumph over Dutch teenager Niels Vink in the US Open quad singles final on Sunday, that this could have been his farewell to Flushing Meadows.

If it is the last time the New York slam sees this remarkable Australian entertainer in action, Alcott was happy to leave them with a typically effervescent farewell.

"Thanks for making the dreams of a young fat disabled kid with a really bad haircut come true because I cant believe I just did it!" he told the Louis Armstrong Stadium crowd.

"I just cant believe I just won the golden slam!"

Then he was off to the Arthur Ashe Stadium to watch the men's singles final between Daniil Medvedev and Novak Djokovic, opening a can of beer for the cameras, pouring it into his trophy, chugging it all down and then plonking the upside-down Cup on his head.

Cue cheers all round from the Flushing Meadow crowds who had earlier watched him produce a vintage display to outclass the 18-year-old Vink, the sport's new rising star who had pushed Alcott to three sets in a classic at the Paralympics.

This time, the only real worry seemed to come at the start for Alcott as he waited a mite anxiously for his match wheelchair to be brought to the court.

At the end of an uneven first set in which serve was broken seven times, Alcott produced his best tennis, racing to retrieve a net cord and then somehow finding a dazzling lob to win the set 7-5 with his 17th winner of the stanza.

From there, he was in complete control, taking victory in an hour and a quarter after adding another 11 winners.

After praising Vink for pushing him to a new level, Alcott told the crowd: "I used to hate myself so much, I hated my disability, I didnt even want to be here any more and then I found tennis and it changed and saved my life.

"And now I'm the only male in any form of tennis to win the golden slam, which is pretty cool."

Alcott has won 20 of his 21 matches this season and a 15th singles grand slam but is considering his future after achieving something unsurpassable.

"I've got to be up front - I don't know if I'll be back here," he told the crowd.

Earlier on Sunday, Dutchwoman Diede de Groot, the top seed, achieved the 'golden slam' in the women's wheelchair singles, beating Japan's Yui Kamiji 6-3 6-2 in a rematch of their gold medal encounter at the Tokyo Paralympics.

In the equivalent men's singles, Japan's top seed Shingo Kunieda beat second-seeded Briton Alfie Hewett 6-1 6-4.

© AAP 2021

Premier Gladys Berejiklian has told people in NSW to stay vigilant in her last daily morning briefing ahead of an incoming peak in COVID-19 cases and a "challenging" two months.

There were 1262 new locally acquired COVID-19 cases and seven deaths, including a man in his 20s, recorded in NSW on Sunday.

The premier said there had been some stabilisation of infection numbers in the local government areas of concern but the virus was "picking up pace" in certain suburbs.

"We can't afford to let our guard down," Ms Berejiklian told reporters at the last press conference of its kind on Sunday.

"We cannot afford to not keep doing what we've been doing because otherwise we will see too many cases when we open up at 70 per cent double dose and that isn't what we want to see."

The daily 11am updates will from Monday be replaced by a video from NSW Health to communicate the new case numbers and concerns of the day.

The seven deaths reported in the 24 hours to 8pm on Saturday include a man in his 20s from western Sydney and six people from south-western Sydney in their 40s, 50s, 70s and 80s.

Chief Health Officer Kerry Chant said the man in his 20s was unvaccinated and had significant underlying health conditions.

"However, I just want to make the point, that while you are likely to have more severe COVID if you are older and have underlying health conditions, even previously healthy people of all ages can get severe disease and die," Dr Chant said.

When asked to respond to images of people flocking to beaches in Sydney's east over the weekend, Dr Chant said it caused her "some concern" but said the reality was outdoor environments were "probably the safest" if people were social distancing.

"I would like to see that people are really respectful and they are adhering to the public health orders as they move about," she said.

There are currently 1206 COVID-19 patients in NSW in hospital, with 220 in intensive care and 92 ventilated.

By midnight on Friday 78.1 per cent of the over-16 population had received a first dose of a COVID-19 vaccine, and 45.6 per cent were fully vaccinated.

Meanwhile state and federal opposition leaders have criticised the plan to scrap the daily live-streamed briefings weeks before the COVID-19 crisis is expected to peak in NSW.

But Ms Berejiklian defended the government's decision and said she would still front the media when necessary whether it was seven or three days a week.

"While there would be ample information provided on a daily basis, I will not necessarily be the one providing the information on a daily basis, and that is because, as I have said, I need a clear head," she said on Sunday.

"The next two months will be the most challenging our state has seen perhaps ever. And I need to make sure we are not only making decisions for the next day but for the next week and next month."

Elsewhere, thousands of NSW residents across the state's northeast and southwest enjoyed their second day of freedom in weeks as stay-at-home restrictions lifted on Saturday for regional centres of Coffs Harbour, Wagga Wagga and Albury.

Masks are mandatory at indoor public venues, but hospitality, retail and sporting spots have all been cleared to reopen with restrictions while rules for indoor and outdoor gatherings have been relaxed with limits.

© AAP 2021

On the seventh anniversary of William Tyrrell's disappearance, homicide squad detectives have returned to the NSW mid-north Coast town where he was last seen to comb for clues.

The three-year-old, dressed in a Spider Man outfit, vanished while playing in the garden of his foster grandmother's home in Kendall shortly before 10.30am on September 12, 2014.

Within hours, hundreds of local residents and emergency service workers combined to search the rural community, looking in scrub, creeks and paddocks for William.

Police formed the view the disappearance stemmed from human intervention, and in March 2019 an inquest started into William's disappearance.

It remains ongoing.

Detectives are continuing to conduct interviews, searches and other investigative activity, including those under coronial orders, as well as reviewing all available materials with the assistance of various experts.

Detective Chief Inspector David Laidlaw said the Strike Force Rosann team returned to Kendall to have another look at the home where William was last seen, along with other areas nearby.

"Further information has since come to light, as part of our ongoing review of the materials gathered by investigators since the moment William went missing seven years ago," the strike force officer-in-charge said in a statement on Sunday.

"As our team continue to conduct inquiries and explore all avenues of investigation, our focus has been identifying if anything has been missed, or if there are any details - no matter how small - that need to be clarified.

"Police remain committed to finding out what happened to William, but our most important job here is to bring him home for both families."

In September 2016, the NSW government announced a $1 million reward for information that leads to the recovery of William, which remains on offer.

© AAP 2021