A third consecutive Australian Open quarter-final beckons for Ash Barty but the world number one is far from satisfied as she eyes a drought-ending title in Melbourne.

Barty produced a masterclass to blitz American Shelby Rogers 6-3 6-4 in the fourth round on Monday.

Not since Wendy Turnbull in 1984 has an Australian woman reached three successive quarter-finals or more at Melbourne Park, where Barty will meet Karolina Muchova in the last eight.

But 2019 French Open champion Barty is dreaming big as she looks to become the first Australian woman since 1978 to take the title.

"We're not done yet," Barty,a semi-finalist last year, said. "Obviously it's exciting to be in another quarter-final of a grand slam, particularly here in Australia.

"If we had looked at the way we were preparing during our pre-season, to have the start that we have had so far is really encouraging, but certainly not satisfied with where we're at at the moment. 

"We will keep chipping away and keep trying to do the right things to progress as far as we can."

Barty arrived in Melbourne at the start of the year having not played in a competitive WTA Tour event since February 2020 due to the coronavirus pandemic.

Asked about the prolonged break, Barty – who stepped away from tennis in 2014 before returning in 2016 after playing cricket – said: "I think I know that I've done the work. I know that we prepared in the right way during the pre-season. 

"We've done all the work to try to give myself the opportunity to play a good level of tennis and to a level that I know I'm capable of. It's just knowing that I put the trust in the work that we've done, more than surprising myself.

"I think I've known that I've done the work. I have the ability to play at this level and then it's just about going about all of our processes, our routines the right way. All of those came back quite naturally.

"It's something that I've practiced a lot, and I gain my confidence from that practice and from those preseasons as opposed to just match results."

Jessica Pegula said she "can't be more confident" after upsetting Elina Svitolina to reach her first grand slam quarter-final and Ash Barty stayed in the hunt for Australian Open glory on Monday.

Pegula, the daughter of NFL and NHL franchise owners of the Buffalo Bills and the Sabres, beat fifth seed Svitolina 6-3 3-6 6-3 on Rod Laver Arena to set up a showdown with her fellow American and friend Jennifer Brady.

Brady made it all the way to the semi-finals of the US Open last year and has now put together her best run at Melbourne Park after seeing off Donna Vekic 6-1 7-5.

World number one Barty has not dropped a set in her home major and started the second week by dispatching Shelby Rogers 6-3 6-4.

The top seed from Queensland's next assignment will be a meeting with Karolina Muchova, who saw the back of Elise Mertens 7-6 (7-5) 7-5.

Muchova, the 25th seed from the Czech Republic, has made it through to her second grand slam quarter-final - having also reached this stage at Wimbledon in 2019 - without losing a set.

Pegula to put friendship to one side

Pegula and Brady are close friends, but they will have to put that to one side when they meet in the quarter-finals.

The world number 61 claimed her first victory over an opponent ranked in the top 10 just over a month after Svitolina beat her in straight sets in Abu Dhabi.

Pegula hit 31 winners to Svitolina's 19 and won 21 points from 29 when she made a trip to the net as she broke new ground at a major

She said: "I can't get more confident, it's my best result yet and I'm playing good tennis. Today was a hard-fought win, so, yeah, feeling pretty good."

Pegula added on the prospect of facing Brady: "We're here to have fun and compete. If I can do it against somebody that I like, that I wouldn't mind if they beat me, hopefully not, but if they did, why not?"

Brady benefited from strict lockdown

Many players understandably struggled during and after being in a strict two-week lockdown in a hotel room following their arrival in Australia.

Brady was among the players who were not allowed out of their rooms for a fortnight, but said she used the situation to recharge her batteries before the first major of the year.

The 22nd-seeded Pennsylvanian said: "I think it was a little bit of a benefit for me, just taking a break from tennis. I had been going non-stop since World Team Tennis in June. I didn't take any time off.

"I was playing from June and then played US Open, the U.S. tournaments, and then went straight to Europe, then finished there and was training in Europe, then went home for Christmas and then came and started in Abu Dhabi.

"So obviously I didn't really feel super fresh mentally coming into Abu Dhabi. And then when I was away from tennis for two weeks, I felt like I wanted to play again to compete and I think that helped me."

Much improved Czech

Muchova had not been beyond the second round of the Australian Open before last week but now has a semi-final spot in her sights.

The 24-year-old was 4-0 down in the opening set as Mertens got off to a flyer but warmed to the task with her battling spirit and positive approach.

Muchova converted five of the six break points she earned on Margaret Court Arena, also coming from a mini-break down in a first-set tie-break.

She struck 25 winners to Mertens' 15 and advanced despite making 31 unforced errors, getting her rewards for throwing caution to the wind.

World number one Ash Barty secured another quarter-final berth at the Australian Open after outclassing Shelby Rogers 6-3 6-4.

It was a Barty party on Rod Laver Arena, where the 2019 French Open champion dominated from the outset to see off unseeded American Rogers in a little over an hour on Monday.

Barty, who appeared in the semi-finals in Melbourne last year to become the first Australian woman to reach that stage since Wendy Turnbull in 1984, raced past Rogers to set up a meeting with Karolina Muchova.

Home hope Barty and Rogers renewed acquaintances behind closed doors in the last 16 after the former won a match tie-break against last year's US Open quarter-finalist en route to claiming the Yarra Valley Classic.

Barty was unstoppable from the start, striking first in the fourth game and breaking for a 3-1 lead after precision play left Rogers helplessly scrambling around the court.

There was a test for Barty after Rogers earned a pair of break points in the seventh game, but the former saved both.

It was the only real challenge in a first set controlled by Barty, who continued where she left off in the second.

While Rogers showed glimpses, Barty – moving freely with all eyes on her heavily strapped thigh – was firmly in the groove as she broke for a 2-1 lead.

Another break followed but there was a blip for Barty, who was broken for the first time when serving for the match at 5-2 in a late Rogers resistance which only delayed the inevitable.

Data Slam: ​Three in a row for Barty
Barty will contest her third consecutive Australian Open quarter-final. Not since Wendy Turnbull in 1984 has an Australian woman enjoyed such a run. Barty is bidding to become the first Australian woman to win the grand slam since 1978.

WINNERS/UNFORCED ERRORS
Barty – 21/16
Rogers – 14/25

ACES/DOUBLE FAULTS
Barty – 5/3
Rogers – 5/1

BREAK POINTS WON
Barty – 3/6
Rogers – 1/3

Rafael Nadal insisted he is not "obsessed" in his quest for further grand slam glory after the 20-time major champion moved through to the Australian Open quarter-finals. 

Nadal advanced to the last eight of the tournament for the 13th time in his illustrious career following Monday's dominant 6-3 6-4 6-2 victory over 16th seed Fabio Fognini.

World number two Nadal is bidding to claim a record 21st slam crown, while the Spanish star is also looking to become the first man in the Open Era to win each of the four majors twice.

As Nadal looks ahead to a showdown with fifth seed Stefanos Tsitsipas, he discussed his motivations, having won everything on offer on the ATP Tour.

"I play tennis. I like tennis," the 34-year-old said. "I like what I am doing. That's the main thing. 

"Of course I am very motivated to win grand slams and to play in the most important events of the year. No doubt about that.

"The only thing that I said is I have never been obsessed to try to be the best or to try to – no, I just did my way. That worked for me.

"I think the ambition is important, to have an ambition, but a healthy ambition. If you have too much ambition then you can be frustrated when you are not able to achieve all the things that you wanted.

"I never approached the sport and my career that way. That's it. I enjoy, I give my best always. I try to compete at my highest standards every day. Sometimes the highest standards are 60 per cent, sometimes they are 100 per cent. But I just try to give my best throughout my career, and that's it.

"For me the main thing is come back home with personal satisfaction that you gave it everything. That's what gives me happiness and makes me stay calm."

Nadal was under an injury cloud heading into the year's first grand slam due to a back problem which forced him to sit out Spain's ATP Cup campaign in Melbourne.

But the 2009 Australian Open champion has looked comfortable at Melbourne Park, where he is yet to drop a set.

"I played first set without a doubt [against Fognini] has been my best level in the tournament," Nadal said. "It's normal, too, because I was able to practice for two days in a row. That makes an important difference. 

"But at the same time, it's important to find positive feelings now. My physical condition needs to keep improving. But I think this match helps, too.

"I was not able to practice the proper way for the last 19 days, but yesterday [Sunday] I started again to increase the amount of work on the practice, and today has been a positive victory with some long points, so that helps for the next match."

Rafael Nadal's bid to win a record 21st grand slam title remains on track, while there is a distinctly Russian flavour to the quarter-final line-up at the Australian Open.

World number two Nadal eased past Italian 16th seed Fabio Fognini behind closed doors at Melbourne Park in sunny and warm conditions on Monday.

Daniil Medvedev and Andrey Rublev ensured Russia made history en route to the quarters in Melbourne.

FAMILIAR TERRITORY FOR NADAL

Nadal reached the Australian Open quarter-finals for the 13th time in his career after outclassing Fognini 6-3 6-4 6-2 on Rod Laver Arena.

Stuck on 20 slam championships alongside Roger Federer, who is absent in Melbourne, Nadal is also looking to become the first man in the Open Era to win each of the four majors twice.

The 2009 Australian Open champion was too good for Fognini as Nadal continued his fine run of not dropping a set en route to the last eight in 2021.

Only at the French Open, where he is a 13-time champion, has Nadal reached the quarter-finals more often (14) than at the Australian Open. Federer (15) and John Newcombe (14) are the only men to have reached more Australian Open quarter-finals.

Nadal, who hit 24 winners against Fognini, will face fifth seed Stefanos Tsitsipas for a place in the semi-final after ninth seed Matteo Berrettini withdrew with an abdominal strain before Monday's showdown.

HISTORY FOR RUSSIA​

For the first time in the Open Era, three Russian men have advanced to the quarter-finals of a slam.

Medvedev – the fourth seed – and Rublev joined countryman Aslan Karatsev in the last eight following their respective triumphs on Monday.

Runner-up at the 2019 US Open, Medvedev made light work of American Mackenzie McDonald 6-4 6-2 6-3, extending his winning streak to 18 matches as he reached his maiden Australian Open quarter-final.

"It's an exciting moment to be in the quarters in Australia for the first time. That's a great achievement for me," Medvedev said.

"I want more all the time, but step by step. So this is amazing … I finished at 1.30 [hours], which is important in the later stages of the grand slams, to make fast matches."

It will be an all-Russian affair in the quarters after seventh seed Rublev benefited from a walkover.

Rublev was leading 6-2 7-6 (7-3) when Norway's Casper Ruud retired on Margaret Court Arena.

"At least one of us will be in the semi-finals. So it's good news but yeah, it's going to be a tough match," said Rublev, who featured in last year's French Open quarter-finals.

"Last time he beat me in the quarters in the US Open. So now we're in the quarters in the Australian Open, so we'll see what's going to happen."

Los Angeles Lakers star Anthony Davis said he felt "completely fine" before aggravating an Achilles injury in the NBA champions' defeat to the Denver Nuggets as he awaits the results of an MRI scan.

Davis, who posted 15 points in 14 minutes, suffered an Achilles strain in the Lakers' 122-105 loss to the Nuggets on Sunday.

The seven-time All-Star was held out of the second half as the Lakers saw their seven-game winning streak snapped.

Davis, who returned from a two-game absence caused by Achilles tendonitis on Friday, will undergo a scan on Monday.

"Just driving, I think that last step kind of re-aggravated the injury I already had," he said. "Now, it feels like an Achilles sprain. 

"Got an MRI tomorrow and try to figure out the next steps to get on the floor."

Davis – who insisted he and the Lakers followed all the right steps for his initial return – added: "Today was the first day that it felt completely fine. I didn't feel it at all this morning, afternoon, pre-game. I felt like I was heading in the right direction. 

"The treatment and rehab side. Another setback but it's part of the game. More so frustrated that I couldn't go out there and play, but you don't want to mess around with this type of injury. Trying to figure out the best steps.

"I felt great coming back the first time against Memphis [Grizzlies]. I'll do the same thing, the same steps to get it back right. Be smarter with it, I was smart the first time, but even smarter this time. Up the treatment more to get it back where it used to be to help the team."

Superstar Lakers team-mate LeBron James, who led the Lakers with 22 points, 10 rebounds and nine assists, added: "Just want him to be healthy and get back to full strength. All I care is about his health.

"It's definitely deflating anytime you lose a big player – a big guy on your team.

"We have a lot of things that's built in around AD and a lot of other players. When he goes down, you have to switch up. That hurt us."

Rafael Nadal reached the Australian Open quarter-finals for the 13th time in his career with a straight-sets win over Fabio Fognini.

The Spanish star again looked in strong form in a 6-3 6-4 6-2 victory over Italian 16th seed Fognini behind closed doors on Rod Laver Arena on Monday.

Nadal, who is aiming to win a men's record 21st grand slam title in Melbourne, is yet to drop a set at the year's first major and beat Fognini for the 13th time in 17 meetings.

The world number two will face either Stefanos Tsitsipas or Matteo Berrettini in the last eight.

Nadal gave up an early break lead against Fognini but a powerful forehand return led to another and a 4-2 lead.

Despite serving at just 42 per cent, Nadal closed out the opening set.

Fognini was unable to consolidate a break lead in the second set, having led 4-2, before Nadal recovered from 0-40 down to hold in the eighth game.

That would prove a decisive hold, Fognini blasting a ball into the stands after netting a volley to give Nadal a break point, converted when a forehand went wide before the Spaniard secured the set.

Fognini handed Nadal his only loss from two-sets-to-love up at a grand slam at the US Open in 2015, but a break for 2-1 in the third saw the latter end any chances of a repeat on his way to a convincing win.

Data Slam: Nadal's fine Australian Open record
Only at the French Open, where he is a 13-time champion, has Nadal reached the quarter-finals more often (14) than at the Australian Open. Roger Federer (15) and John Newcombe (14) are the only men to have reached more Australian Open quarter-finals.

WINNERS/UNFORCED ERRORS
Nadal – 24/20
Fognini – 32/35

ACES/DOUBLE FAULTS
Nadal – 6/3
Fognini – 7/3

BREAK POINTS WON
Nadal – 6/19
Fognini – 2/6

Brooklyn Nets star Kevin Durant will miss at least two games due to a mild left hamstring strain.

The Nets confirmed the injury on Sunday, a day after Durant returned from the NBA's health and safety protocols amid the coronavirus pandemic to help Brooklyn past the Golden State Warriors 134-117.

Durant, who posted 20 points against former team the Warriors in his first game back in the Bay Area, will sit out Monday's clash with the Sacramento Kings and Tuesday's game against the Phoenix Suns.

Former NBA MVP and two-time champion Durant is averaging 29.0 points, 7.3 rebounds and 5.3 assists per game for the Nets this season.

Durant, who sat out his first season in Brooklyn due to an Achilles injury sustained in the 2019 NBA Finals during his time with the Warriors, has missed nine of 28 games in 2020-21.

The star-studded Nets (16-12) are third in the Eastern Conference following back-to-back wins.

Serena Williams is moving better than she has in years, according to her coach Patrick Mouratoglou.

Williams, 39, has looked in good form at the Australian Open as she eyes a record-equalling 24th grand slam singles title.

The American has dropped just one set on her way to the quarter-finals, in which she faces Simona Halep on Tuesday.

Mouratoglou said Williams' movement was the best it has been in several years.

"First of all, it's something that we have put the emphasis on because in tennis that's probably one of the most important things. If you are late on the ball, you can't do what you want to do. Sometimes you don't even touch the ball," he told a news conference on Monday.

"It's a sport where you have to be able to move fast from side to side and long enough. It's something that probably in the last two, three years, this had consequences for Serena.

"Even more, when you're not in a good day, you need a plan B. To be able to have a plan B, you have to be able to move well. If you can't move well, there is no plan B. The only plan is attack.

"I think it cost her a few important matches. So we have decided to find a way to bring back the footwork that she used to have in the past. I feel like she's done a great job. She's moving much better."

Williams last won a major title in Melbourne in 2017, losing four grand slam finals since then.

With all eyes on her as she aims to equal Margaret Court's record of 24 grand slam singles titles, Mouratoglou insisted that mark was not an obsession for Williams.

"Does she need that validation? I don't think she needs that validation.  But, I mean, clearly she came back to tennis to win some other grand slams, so that's for sure the goal," he said.

"Now, she's not as obsessed with the 24 than most of the people in the tennis world, but definitely she wants to win grand slams. That's the only reason why she came back to tennis."

Kemba Walker is confident the Boston Celtics will overcome their form slump after falling to another loss on Sunday.

The Celtics suffered their 10th loss in their past 15 games with a 104-91 defeat to the Washington Wizards.

Walker, who posted 25 points in the loss, was upbeat about the Celtics' chances of turning their season around.

"We've got to change some things, and we will. We will," Walker said.

"I'm very confident that we will change things and we will continue to get better. It'll change because it's not a great feeling the way we're playing. It can't get no worse than this. We're going to fix it."

Jaylen Brown also posted 25 points, but Jayson Tatum struggled, going three-of-14 from the field for just six points in 23 minutes.

Walker said the Celtics, who are now 13-13, would work together, with their next outing coming against the Denver Nuggets on Tuesday.

"Teams go through adversity every single year at some point in the season," he said.

"It's all about how you overcome it. The only way you can overcome adversity is by doing it as a whole, doing it together. And that we will do."

Romelu Lukaku answered any recent criticism aimed in his direction against Lazio and Christian Eriksen is starting to understand what Inter require of him, says Nerazzurri coach Antonio Conte.

Inter bowed out of the Coppa Italia at the semi-final stage after a goalless draw at Juventus ensured a 2-1 aggregate defeat, but a 3-1 triumph over Lazio on Sunday saw Conte's side leapfrog rivals Milan at the top of Serie A.

Lukaku scored twice in the first half to move on to 300 career goals, and Lautaro Martinez was on target after Gonzalo Escalante had replied for the visitors at San Siro.

Speaking about the Belgium striker's showing, Conte told Sky Sport: "Romelu, like the whole team, gave a great response. Lautaro did, so did Ivan Perisic, the defenders, Marcelo Brozovic. They all stepped up.

"Some were starting to murmur about Lukaku after the Coppa Italia and a few lacklustre performances, suggesting he had some psychological blowback from that, but there are moments when you are not at 100 per cent.

"He came back firing on all cylinders and we need this Romelu. We need this determination and passion from everyone in the team."

Eriksen signed from Tottenham amid much fanfare in January 2020 but struggled to hit the ground running and was heavily linked with an exit last month.

However, the Denmark playmaker stayed put and has since impressed, something Conte puts down to becoming familiar with the requirements of Italian football.

"I think Christian had a few problems settling in, understanding Italian football, which is very difficult and tactical compared to the Premier League. There is also a far greater intensity now than in previous years here," Conte added.

"We tried in every way to settle him in, even changing tactical system. I think now he has made a step towards us, is starting to understand Italian, which is an important development too. He is understanding what we need.

"Eriksen was very focused when defending as well as attacking. He has a different power to his leg now after the fitness work.

"He's an extra option for us and I am more comfortable relying on him now."

Next up for Inter is a huge derby clash with Milan, a match that is sure to have huge ramifications on the outcome of the Scudetto.

Conte is relishing the challenge after seeing off a Lazio side that had won six straight league games.

"This was an objective we'd been chasing for a long time, to get to the top of the table, we achieved it after a game against a very strong team," he added.

"I congratulate Lazio and Simone Inzaghi, as they are tough, organised and with a lot of quality.

"The fact they were coming off six consecutive victories shows their strength, but at the same time it shows our mental strength.

"I am happy for the lads, inevitably this must be a starting point for us and not the finish line. We know the next game is the derby with Milan, going into it ahead is obviously much better.

"It's going to be a fascinating game between two teams who have strong ambitions."

Romelu Lukaku scored twice and assisted another to help Inter to a 3-1 win over Lazio that lifted Antonio Conte's men above bitter rivals Milan to the top of Serie A.

Milan's shock 2-0 loss to Spezia on Saturday opened the door for Inter and they pounced at San Siro on Sunday, taking a one-point lead into next weekend's huge Derby della Madonnina.

Lazio were furious with the awarding of Inter's 22nd-minute penalty as replays appeared to show Wesley Hoedt, drafted in after Stefan Radu was injured in the warm-up, got some of the ball before taking out Lautaro Martinez.

Lukaku converted and added a second ahead of half-time with the assistance of VAR, before teeing up Martinez to seal the points after Gonzalo Escalante had given Lazio some temporary hope.

There had been little between the sides prior to the controversial penalty call, with the VAR standing by referee Michael Fabbri's decision to point to the spot for Hoedt's challenge on Martinez.

Lukaku sent Pepe Reina the wrong way to extend his perfect penalty record in Serie A to 10 from 10, and the Belgium international did not have to wait long for the landmark 300th career goal for club and country.

It had an element of fortune about it as Marcelo Brozovic slid in on Manuel Lazzari and the ball ricocheted into the striker's path, though it took a lengthy VAR check to ascertain that Lukaku was level with the last man when the initial pass was played.

Lazio had found the net in each of their past 17 league outings, however, and they kept that run going when Sergej Milinkovic-Savic's free-kick heavily deflected off substitute Escalante and beat Samir Handanovic on his 500th Serie A appearance.

But just when the visitors had some momentum on their side, Lukaku charged down the right, held off Marco Parolo and unselfishly squared the ball for Martinez to tap into an empty net.

Reina denied Lukaku a hat-trick with a good save down low but Inter, knocked out of the Coppa Italia by Juventus in midweek, retained their two-goal cushion to move to the summit.