Received

The job not done, Nick Kyrgios placed the champagne on ice after once again making a mockery of the rankings and blowing the US Open wide open with a rollicking fourth-round win over world No.1 and defending champion Daniil Medvedev.

In an explosive encounter laced with controversy and drama, Kyrgios risked being defaulted and overcame a running verbal battle with the chair umpire before ousting the top seed 7-6 (13-11) 3-6 6-3 6-2 on Sunday night.

It was the Wimbledon runner-up's second defeat of Medvedev in three weeks and vaulted Kyrgios into the quarter-finals at Flushing Meadows for the first time.

"It was an amazing match," Kyrgios said.

"Obviously Daniil is defending champion. A lot of pressure on his shoulders, but I played really well. I've been playing amazing for the last couple of months.

"But what a place - packed house in New York, I'm extremely blessed.

"I'm just really happy and hopefully I can keep it going."

At last realising his rich potential, the 27-year-old will play another Russian, Karen Khachanov, for a semi-final berth on Tuesday (Wednesday AEST).

"Hopefully I can go all way," Kyrgios said before revealing he deliberately didn't over-celebrate for that very reason.

"It's only fourth round. I've got quarter-finals.

"It was an amazing experience obviously taking down the No.1 player in the world on Arthur Ashe Stadium but I don't really like to celebrate too much after that.

"I know that if I played him nine more times, he's probably getting on top of me the majority of the time.

"So I just take it, just get back to the right things. I just stay in the moment, and that's it."

Now three wins away from breaking his grand slam title duck, Kyrgios was imperious at times.

He received a standing ovation after winning a pulsating opening set that stretched more than hour.

Other times, he flirted with disaster.

He looked to have thrown away the first set after giving up a 4-2 lead and then a 4-1 advantage in the tiebreaker, not to mention threatening to hit the self-destruct button and engaging in an unnecessary, elongated exchange with Greek umpire Eva Asderaki-Moore.

The combustible Canberran lambasted Asderaki-Moore for starting the shot clock apparently too early.

"You are the only umpire that I've a problem in this matter," Kyrgios fired at her.

"Use your common sense. Just use it a little bit."

But, after regaining his cool and fighting off three set points, Kyrgios brought up a fourth of his own with an exquisite backhand drop shot that almost spun back over onto his side of the net.

But it wasn't long before tensions really boiled over.

Medvedev fumed at the umpire for not warning Kyrgios after the Australian, frustrated at going down an early break in the second set, went within centimetres of hitting a ball into the first row of the stands, and likely a spectator.

Medvedev then threatened to quit if someone from Kyrgios's courtside entourage wasn't ejected for disrupting the top seed between his first and second serves.

"If they do it a second time, I am not playing they're out, until somebody is out," the Russian raged.

After levelling the match at a set apiece, Medvedev received an extraordinary, possibly unprecedented, gift from Kyrgios.

After looking to have earned a break point in the second game of the third set, when Medvedev couldn't return a ball, Kyrgios ran around the net triumphantly and hit the ball away for a mock winner.

Quite rightly, though, Asderaki-Moore awarded the point to Medvedev because his shot, while clearly not going over the net, was "still in play".

But Kyrgios, somewhat uncharacteristically, shook off the blunder before breaking Medvedev on his next service game to claim a 3-1 lead, then going on to seize a two-sets-to-one lead.

He turned the screws with two more breaks to run away with the match and claim a 20th victory in his past 23 matches after two hours, 53 minutes.

© AAP 2022

Canadian police are hunting two suspects in a stabbing spree that started in an indigenous community and left 10 people dead and 15 wounded across the central province of Saskatchewan.

The stabbings across 13 crime scenes in Saskatchewan on Sunday were among the deadliest mass killings in modern Canadian history and certain to reverberate throughout the country, which is unaccustomed to bouts of mass violence more commonly seen in the United States.

"I am shocked and devastated by the horrific attacks today," Prime Minister Justin Trudeau said in a statement.

"As Canadians, we mourn with everyone affected by this tragic violence, and with the people of Saskatchewan."

Police named the two suspects as Damien Sanderson, 31, and Myles Sanderson, 30, providing photos and descriptions but no further details about their motive or the victims.

In May, Myles Sanderson was listed as "unlawfully at large" by Saskatchewan Crime Stoppers, a program that encourages the public to cooperate with police. There were no further details about why he was wanted.

"It appears that some of the victims may have been targeted, and some may be random. So to speak to a motive would be extremely difficult at this point in time," Rhonda Blackmore, commanding officer of the Saskatchewan Royal Canadian Mounted Police, told a news conference.

There may be additional injured victims who transported themselves to various hospitals, police said.

James Smith Cree Nation is an indigenous community with a population of about 3400 people largely engaged in farming, hunting and fishing. Weldon is a village of some 200 people.

The nation's elected elders declared a state of emergency "in response to the numerous murders and assaults on members of the James Smith Cree Nation," and established two emergency operations centres, the nation said in a statement.

The first stabbings were reported at 5.40am and within three hours police issued a province-wide dangerous persons alert. By the afternoon, similar alerts were also issued in Saskatchewan's neighbouring provinces Alberta and Manitoba.

Police bulletins urged people to report any suspicious people and to take precautions including sheltering in place, while warning against picking up hitchhikers or approaching suspicious people.

© RAW 2022

The consumer watchdog will be on the lookout for unnecessary price hikes as the fuel excise is reinstated in full later in the month.

The reintroduction of the tax will see motorists pay an extra 25 cents per litre, including GST and indexing to inflation, from September 29.

The Australian Competition and Consumer Commission says it won't hesitate to act against anti-competitive behaviour.

"We will shortly be engaging with fuel wholesalers and retailers to say we do not expect to see uncharacteristic or abnormal wholesale and retail price increases in the days leading up to, and on the day of, or after, the reintroduction of the full rate of fuel excise," chair Gina Cass-Gottlieb said.

The regulator also warned petrol stations against false and misleading statements to consumers about why prices were increasing.

Ms Cass-Gottlieb said the maximum penalty for retailers providing misleading pricing information was $10 million, if legal proceedings were taken.

The ACCC also released its quarterly report on fuel prices, which shows the fuel tax did cushion customers at a time of "record and rising wholesale prices".

However, in real terms, petrol prices in the June quarter were the highest since the September quarter in 2008.

The report also shows prices had "come down quite a lot" since July due to increased supply, lockdowns in China and a worsening global economic outlook.

Petrol prices fell by 4.4 cents last week, to a national average of $1.72 a litre, according to Australian Institute of Petroleum data. This follows two consecutive weeks of increases.

Fuel prices fell across most capital cities except Adelaide and Canberra.

Rather than calling for the tax cut to be extended, the NRMA wants it phased out and replaced with a more "progressive and equitable" road user charge model.

This would see motorists initially charged a tax based on the distance they travel, plus caps on charges to "ensure cost neutrality".

"Once established, a road user charge should evolve to consider further use factors to improve equity and road network efficiency, including location, time of day and vehicle type," NRMA membership and motoring chief Emma Harrington said.

The body said the fuel excise penalises regional and remote drivers without public transport options and unfairly hits struggling families unable to afford to upgrade to more fuel-efficient cars.

The NRMA does not want the road user charge to become a barrier to EV uptake. In the past, it has supported policies that hit low emissions vehicles with road user charges only once they make up at least 30 per cent of new car sales.

Despite pressure to extend the tax cut to relieve pressure on household budgets, the government says it's too expensive to keep.

Prime Minister Anthony Albanese described it as a "difficult decision".

"If prices rise ... of course, it has an impact but that has been factored in by the economic analysis," he told ABC Radio.

"We have to make decisions based upon what we can afford and we have $1 trillion of Liberal Party debt."

The Reserve Bank is tipped to raise rates by at least 50 basis points on Tuesday, further pinching household budgets.

Mr Albanese said he maintained full confidence in the Reserve Bank's management of inflation.

Leader of the opposition in the Senate, Simon Birmingham, did not push for an extension of the fuel excise tax cut because oil prices had fallen.

"(The fuel excise cut) was designed at the time to deal with spikes in oil prices. And some of those spikes have come off now," he said.

In March, his government halved the fuel excise by 22 cents for six months in response to soaring fuel prices.

© AAP 2022