Coco Gauff reflected on a hugely disappointing Australian Open defeat as the two leading United States players exited the women's draw on day one in Melbourne.

Gauff is ranked 16th, closing on top American Sofia Kenin in 13th, but neither advanced to the second round on Monday.

The 17-year-old was stunned 6-4 6-2 by Wang Qiang in a sloppy display that included 38 unforced errors, with 21 in a second set in which she fell 5-0 behind.

Meanwhile, Kenin was beaten by compatriot Madison Keys, who came into the tournament in high spirits having won her sixth career title – and first since 2019 – at the Adelaide International 2. That run included a semi-final defeat of Gauff.

After her latest loss, Gauff said: "I think just everything disappointed me about today.

"I feel like in the pre-season I worked really hard, and I felt like I was ready to have a good run here. Today I just didn't perform well.

"I think there's a lot to learn from. I think I was playing a little bit tighter than normal.

"So I think next time coming into the first round of a slam, especially after a tough week before, I think I need to just play more free and focus on the moment."

Keys is playing with that freedom, eager to move on from a dismal 2021 in which she won only 11 matches.

"I'm not taking it quite as seriously, that's the biggest difference this year," she said.

Keys already has seven wins in eight matches in 2022, defeating fellow Americans in each of her past three outings.

Of the win over 2020 champion Kenin, she said: "At this point every first round is tough, but when you have to go up against a grand slam champion it's never easy.

"I think knowing that she was going to compete so well, I just had a really good mentality and attitude. I had a couple of opportunities I didn't really capitalise upon and I was able to reset and continue to play well.

"I had my first real run in a slam here, I missed last year, so absolutely ecstatic to be back in Melbourne. It would mean the world to have another run here."

Burkina Faso clinched a place in the last 16 of the Africa Cup of Nations despite being held to a 1-1 draw by Ethiopia in their Group A finale.

Finalists in 2013, Burkina Faso do not look like threatening to go that far on this evidence, with Ethiopia unfortunate not to claim all three points.

Ethiopia striker Getaneh Kebede saw a bending effort kept out of the top-left corner by Sofiane Ouedraogo in the 10th minute.

They had four shots on target in the first half but it was Burkina Faso who had the only one to find the net, Cyrille Bayala lofting over Teklemariam Shanko after latching on to Adama Guira's superb chipped pass in the 24th minute.

Kebede was then denied again by Ouedraogo from close range, but he eventually got his reward for an impressive performance from the penalty spot.

Steeve Yago was adjudged by the VAR to have handled a free-kick in the area and Kebede coolly stroked into the bottom-left corner from 12 yards seven minutes into the second half.

But the draw proved enough to send Burkina Faso through as Cape Verde – whom they beat in their previous encounter – also drew 1-1 with group winners Cameroon. Ethiopia go home with just a point to their name from only their second AFCON appearance since 1982.

Africa Cup of Nations hosts Cameroon are through to the knockout phase as Group A winners despite being held to a 1-1 draw by Cape Verde, who may well join them in the next round.

Cameroon had already been assured of a place in the knockouts after winning their first two games but they were unable to finish Group A with a spotless record.

It looked like they might when Vincent Aboubakar scored yet again to take his tournament tally to five in three games, the striker finding the bottom-right corner from the edge of the box in the 39th minute.

But the Blue Sharks levelled with what proved to be their only shot of the second half just after the break, and it was a stunner.

Garry Rodrigues met Kenny Rocha Santos' cut-back with a cheeky back-heeled finish past Andre Onana.

That goal keeps Cape Verde's hopes of progression alive – they finish the group behind Cameroon and Burkina Faso but stand a good chance of taking one of the knockout places awarded to the four best third-placed teams.

Patrick Mahomes revealed the Kansas City Chiefs were motivated by being "p****d off" by a slow start to the Wild Card round against the Pittsburgh Steelers in their 42-21 blowout win.

The Chiefs were shut out in the first quarter by a Steelers team that snuck into the playoffs as the seven seed and then fell behind when T.J. Watt returned a Mecole Hardman fumble for a touchdown.

But Mahomes took over thereafter, throwing for 404 yards and five touchdowns, a sole interception in the first quarter the only blemish on a blistering performance.

Tight end Travis Kelce also threw a touchdown on a trick play as the Chiefs turned on the style in setting up a rematch of last year's AFC Championship Game with the Buffalo Bills in the Divisional Round.

"I think we were all p****d off at ourselves," Mahomes said in his media conference. "We felt like we weren't playing with enough energy, we felt like we weren't executing at a high enough level and not playing with enough urgency.

"So, I feel like guys really motivated themselves. We all kind of talked, it wasn't like one person talking, it was everybody talking to each other, and we came with a different urgency starting in the second quarter and carried it the rest of the game.

"Playing in the postseason games, we have young dudes who hadn't played yet, so they got to get that experience this week.

"And we have those vets that have been in here before and showed that with how Tyreek [Hill] and Trav [Kelce] stepped up in big ways to kind of get us sparked and get us rolling again."

On the matchup with the Bills, who crushed the New England Patriots on Saturday behind a sensational five-touchdown performance from quarterback Josh Allen, Mahomes said: "Yeah I mean you expect a really good football team that's going to play really hard. We're expecting a fight, we're expecting a battle. 

"They have a great offense, great defense, great special teams, and we played them in the AFC Championship last year, and we know that it's going to be another fight for us if we want to try to move on to the AFC Championship Game this year."

Chelsea boss Thomas Tuchel has refused to concede the Premier League title race, despite his side sitting 13 points adrift of Manchester City after their 1-0 defeat at the Etihad Stadium.

Speaking ahead of Chelsea's trip to face Brighton, who have never beaten the Blues in 13 league meetings, Tuchel also criticised the scheduling of his team's trip to the Amex Stadium.

Chelsea are winless in three Premier League games, their longest run without victory under the German coach, but Tuchel, while praising City, claimed his team are still in contention for a first Premier League title since 2017.

"Maybe we have to stop focusing on our own problems, and simply admit that City are in a very strong place", Tuchel said.

"In the last 12 matches they have a 100 per cent record. They earned what they have. Maybe it's necessary to admit this.

"The second thing to say is that we will never give up. Never, never, never, until the race is over.

"I told you many weeks ago that we were in a good place because we were in the middle of the race. Maybe we're not there anymore, but we're still in the race.

"We cannot lower our ambitions because it [the gap to City] is now 13 points, we cannot. We are committed to our goals."

Chelsea managed just one shot on target in their defeat at the Etihad, struggling to make inroads against the team with the most clean sheets in the Premier League (13), but Tuchel seemed content with his side's performance against the champions.

"Last match, like all the five matches we've played now against Manchester City [since Tuchel took charge last year], was 50-50," he said. "We won the first three, but all of them could have gone the other way.

"I'm happy with where the team is, there's no need to doubt the process. We will bounce back and never give in."

Tuchel was also asked about the scheduling of the trip to Brighton, brought forward due to the Champions League holders' appearance at next month's FIFA Club World Cup, and criticised the decision to play the match in the middle of a busy period for his team.

"It's very hard to understand," he said. "Now we have three away games in a row. Both Brighton and we have our next games on Sunday, so there was no need to put it on a Tuesday.

"Now it's been squeezed in this week. Last week we didn't have a whole week to prepare for Manchester City because we had the Carabao Cup semi-final.

"On one hand I don't want to complain or to make excuses, absolutely not, but for example, all coaches in the semi-finals [of the EFL Cup] wanted to play just one leg, and it was not possible.

"We could have done better in scheduling this match, for sure."

Samuel Umtiti has fractured the fifth metatarsal in his right foot just a week after agreeing a contract extension at Barcelona, the club announced on Monday.

Umtiti had appeared to be on his way out of Camp Nou this month until a shock new deal was sealed to keep him in Catalonia until 2026.

The World Cup winner, whose previous contract was set to expire in 2023, was linked with a host of clubs, including big-spending Newcastle United.

Instead, Barca kept Umtiti on board when he agreed to a temporary pay decrease that allowed new signing Ferran Torres to be registered.

Whether Umtiti was subsequently set to see his involvement in the first team increase – having appeared in 18 matchday LaLiga squads this season but played just once – will for now remain a mystery, however.

Monday brought news of a serious injury for the France international that will require surgery.

"The first team player Samuel Umtiti took a blow to his right foot in training on Monday and has fractured his fifth metatarsal bone," a club statement read.

"The player will undergo surgery on Tuesday with doctor Antoni Dalmau and with the club's medical services supervising. Another press release will be issued when the surgery has taken place."

Newcastle United plugged one of the two gaping holes in their side in time for last Saturday's huge game against Watford.

Chris Wood made his debut as the club's only fit senior striker following his £25million move from relegation rivals Burnley.

However, at centre-back, Jamaal Lascelles and Fabian Schar were again paired, prompting an all too predictable finale in which the former – Newcastle's captain – was beaten in the air for a dramatic Watford equaliser.

Newcastle have been pushing hard for defensive reinforcements to fit in alongside Kieran Trippier, but Lille insist Sven Botman will not be sold in January and a pursuit of Sevilla's Diego Carlos is also dragging on, while interest in Benoit Badiashile of Monaco – another mooted option – has been complicated by his injury.

Regardless, the Magpies' bottomless budget simply must deliver a centre-back in the coming days, for Eddie Howe's men – still with only a single win this season – risk being cut adrift, as the world's richest club or otherwise.

Fine margins foiling Magpies

Wood did not have an immediate impact, and Newcastle's attackers have struggled to aid their defensive colleagues this season, never once forging a two-goal lead in a game.

But when they have been able to net first, doing so in 10 different matches, including against Watford, that back line has failed miserably to protect their advantage.

Newcastle have dropped a league-leading 21 points from winning positions. With 18 matches to play, an unwanted club record of 31 (in 2004-05) is coming into view.

This dismal trend has resulted in nine draws through 20 games, their most at this stage of a season in the competition's history (beating eight in 20 in 2003-04).

Having lost fewer games (10) than 13th-placed Aston Villa (11) and trailed for only 35 per cent of their time with the ball in play (the same proportion as 10th-placed Leicester City), it will be these draws that relegate Newcastle, with such fine margins deciding their destiny to this point.

Newcastle have missed at least one 'big chance', from which Opta would expect a player to score, in six of their nine draws – including Joelinton on Saturday and each of Sean Longstaff, Ciaran Clark and Jacob Murphy in the reverse fixture at Watford (another 1-1) – while their opponents have been far less profligate with the opportunities afforded by some generous defending.

Generous Geordies giving up gifts

Newcastle have gifted away a league-high 10 goals this term through errors leading to goals (four), penalty goals (five) and own goals (one), representing 23.3 per cent of the alarming total of 43 in the goals against column.

It is a statistic that reflects slightly harshly on the St James' Park outfit, given Newcastle have given up just eight chances through errors. Only Everton (six goals from eight errors) have been punished more ruthlessly.

But there can be no doubt Howe needs upgrades in that area of the pitch.

Not content with squandering opportunities at one end, Clark is the only player in the Premier League to make an error leading to a goal, concede a penalty and be sent off this season – all in the space of 993 minutes. In fact, his error against Manchester City came inside five minutes on his return to the team having been dismissed after nine minutes against Norwich City.

Long-term colleague Lascelles has been little better. He alone has conceded three penalties this term, more than any other player in the division. Meanwhile, Schar is the sole Newcastle player to have committed multiple errors leading to shots.

There are only weak links in the middle of that defence right now.

No Botman and Robin but a DC superhero?

With Trippier already on board, Newcastle could yet recruit an entirely new defence this month, with Howe said to want two centre-backs – Botman and Diego Carlos appear the top targets – alongside a left-back.

Robin Gosens was the latest name to emerge and be dismissed as an option by his current employers, Atalanta, over the weekend, but Newcastle surely have to land at least one of these ambitious targets in time for another vital fixture at Leeds United on Saturday.

Botman showed on Sunday why he is so sought after and why Lille are so keen to keep hold of him, scoring at Marseille while also contributing 12 clearances and three blocks as the 10-man champions earned a draw. It is only the second example in Europe's top five leagues this season (also Dante versus Rennes in December) of a player making at least 12 clearances and three blocks.

Diego Carlos, it would appear, is a more realistic buy in January, despite his importance to a Sevilla team who have conceded only 13 goals in 20 league games this term – a joint-low alongside Manchester City across Europe.

The Brazil Olympic champion has started 19 of those games and leads LaLiga in blocks (21); interestingly, Burnley's James Tarkowski, another player of interest to Newcastle, tops the Europe-wide charts with 29.

Diego Carlos should also bring some calm in possession, with his passing accuracy (88.4 per cent) dwarfing that of Clark (79.0), Lascelles (78.2) and Schar (67.3). The Sevilla man ranks second in LaLiga for passes (1,298) and sixth for forward passes (411), fitting with Howe's more progressive approach.

Yet Newcastle's willingness to push their bid up towards a club-record fee may well be questioned in some quarters due to the more concerning similarities with his potential new team-mates.

No player in Europe has made more errors leading to shots than Diego Carlos, with two of the five resulting in goals. Meanwhile, since joining Sevilla in 2019, he has conceded 10 penalties in all competitions – including three for fouls on current Premier League players in Adama Traore, Marcus Rashford and Romelu Lukaku.

Sevilla have only lost one of those 10 games, peculiarly, perhaps showing the difference Diego Carlos can make outside of these rash moments.

Ideally, Newcastle would not introduce more chaos into this defence, but they certainly cannot afford to do nothing. If Diego Carlos is the man they want, the pressure is on to deliver him in time for Saturday.

Pierre-Emerick Aubameyang's Africa Cup of Nations campaign has finished without him even playing a game as Gabon confirmed he was returning to Arsenal for medical reasons.

Aubameyang tested positive for COVID-19 on January 6, ruling him out of Gabon's Group C opener with the Comoros.

Initially he was expected to return to action for the match against Ghana, which finished 1-1, with Aubameyang addressing the media the day before the game after returning a negative coronavirus test result.

But he was held back on medical grounds after the African Football Confederation (CAF) identified "cardiac lesions" – damage or abnormal change to body tissue – in health checks.

While apparently deemed to be not serious, Gabon have determined the best course of action is to send Aubameyang – and Nice midfielder Mario Lemina, who had a similar diagnosis after also contracting COVID-19 – back to his club for the appropriate medical follow-ups.

A statement read: "The Gabonese Football Federation has decided to put the players Pierre-Emerick Aubameyang and Mario Lemina back at the disposition of their clubs in order for them to follow more in-depth exams."

Aubameyang returns to Arsenal with his future at the club unclear.

The striker was stripped of the captaincy in December after reportedly returning late from a trip abroad, and he was subsequently ostracised from the starting XI.

He did not play again before being allowed to leave early for the AFCON, with Mikel Arteta revealing Gabon's request in that regard had been accepted because Aubameyang was not going to play against Manchester City at the start of the month.

Borussia Dortmund boss Marco Rose is "deeply relaxed" about Erling Haaland's future, despite the striker hinting that he is growing frustrated with the Bundesliga side.

Haaland was on target twice in Friday's 5-1 win over Freiburg to make it 15 league goals for the campaign and 55 in 56 games for Dortmund in all competitions since joining.

Only Bayern Munich striker Robert Lewandowski (79 goals in 62 games) has found the net more often over the past two years among players from Europe's top five leagues.

The Norway international has been regularly linked with a move away from Dortmund, with Real Madrid and Barcelona rumoured to be particularly eager to strike a deal.

And Haaland, who reportedly has a €75million release clause in his contract that will activate in July, stated last week a decision on his future will be made soon.

"The last six months I have chosen not to say anything out of respect for Dortmund, but now the club has started to press me into making a decision," Haaland said.

"All I want to do is to play football. But they press me to make a decision now about my future. So that means that I have to make a decision soon.

"They have started to put a lot of pressure on me, I have to accept that. I have chosen not to say anything out of respect for the club and the fans. 

"But now a lot of pressure is coming from the club, so now is the time to get things started. This is what they want. It means that things will happen now."

That was seen as Haaland venting his frustration at the speculation regarding his future, but head coach Rose does not see it that way.

"It's not a big issue for us," he said at a news conference previewing Tuesday's DFB-Pokal last-16 tie with St. Pauli.

"We spoke briefly on Sunday, but it was mainly about football. I'm deeply relaxed about this topic because I see Erling here every day.

"Erling is looking forward to the cup game and that's the most important thing for me as a coach."

While Rose has no concerns over Haaland, the Dortmund boss admitted to being worried by Giovanni Reyna's recovery from a hamstring issue.

Reyna has been restricted to just four appearances for BVB this term due to an injury picked up on United States duty in September.

He had been expected to return after the mid-season break this month, but the 19-year-old will once again be missing for the midweek cup tie with St. Pauli.

"Gio Reyna is on the right track overall, but of course, he has lost something over time," Rose said.

"We have to get him playable and fit to play. Without wanting to promise too much, let's aim for the break after the Hoffenheim game [next weekend] to get him fully fit again."

Reyna scored and assisted a combined nine goals in the Bundesliga last season, the fifth-most of any Dortmund player, with Haaland leading the way (33).

Novak Djokovic could miss out on defending another of his Grand Slam titles, with France passing new vaccination laws that may threaten his ability to compete at Roland Garros later this year.

The 34-year-old will not defend his Australian Open title, with a drawn-out saga concerning his vaccination status culminating in his visa being cancelled for a second time after an intervention from Australian immigration minister Alex Hawke.

But the controversy surrounding the 20-time Grand Slam winner could be set to continue, with French parliament passing stringent vaccination laws ahead of May's French Open.

After French lawmakers comfortably passed the new measures, proof of vaccination status will soon be required to enter a wide variety of public places, including sports stadiums, and the country's sports ministry says there will be no exemptions for professional athletes. 

"The rule is simple. The vaccine pass will be imposed, as soon as the law is promulgated, in establishments that were already subject to the health pass," the ministry said.

"This will apply to everyone who is a spectator or a professional sportsperson, and until further notice.

"Now, as far as Roland Garros is concerned, it is in May. The situation may change between now and then, and we hope that it will be more favourable. 

"So, we'll see, but clearly, there's no exemption."

Djokovic, who is tied with Rafael Nadal and Roger Federer for all-time Slam wins in the men's game, has come in for widespread criticism regarding his failure to be vaccinated against COVID-19, as well as for appearing in public in the days after testing positive for the virus last month.

Meanwhile, Djokovic has arrived back in his native Serbia, travelling via Dubai from Melbourne to Belgrade after losing a last-ditch court appeal to remain in the country.

Diego Costa confirmed he has left Atletico Mineiro after just five months with the Brazilian club, stoking rumours over a potential return to the Premier League with Arsenal.

The Brazil-born Spain international joined Galo in August on a short-term contract, having been granted his release from Atletico Madrid eight months earlier.

Costa's second spell in Madrid was far less successful on an individual level than his first, which had earned him a £32million move to Chelsea in 2014, with the striker generally impressing in the Premier League as he scored 52 goals in 89 matches.

His August switch to Atletico Mineiro provided Costa with the opportunity to regain fitness after several months away from competitive action.

He featured 19 times for the Belo Horizonte club and scored five times across all competitions, helping them to a Brasileiro and Copa do Brasil double.

Arsenal are said to be interested in signing the 33-year-old on a free transfer, with Mikel Arteta apparently keen for striker reinforcements after Pierre-Emerick Aubameyang was ostracised from the first team.

Costa offered no clues as to where he will end up, however, as he bade farewell to Galo.

"Today, officially, I say goodbye to Atletico," he wrote on Instagram.

"I would like to thank all [Atletico Mineiro fans] for all the support and affection I received from the first to the last day.

"Thank you so much for being part of my childhood dream of playing in Brazilian football and winning titles.

"I would also like to express my gratitude to the entire technical staff, medical department, employees and especially to my teammates who helped me daily, always doing everything to make me feel comfortable.

"The feeling that remains is gratitude to all of you Atleticanos. Thank you and I wish you all the success in the world!"

While Costa could potentially join Arsenal, the Gunners are expected to announce that centre-back Pablo Mari has left on loan for Udinese after struggling for first-team football following the arrival of Ben White.

World number one Ash Barty kicked off her Australian Open title bid with a convincing straight-sets victory over Ukrainian qualifier Lesia Tsurenko on Monday.

The two-time grand slam winner, whose previous best finish on home soil at Melbourne Park was a run to the semi-finals in 2020, prevailed 6-0 6-1 in a time of just 54 minutes.

Barty held serve throughout the one-sided contest with Tsurenko and is now unbroken in 41 successive service games across her last four matches.

"It's certainly nice to be back on home soil and playing as well as I did tonight. It was a lot of fun out here," Barty said in her on-court interview.

"I felt like it was nice and clean. End-to-end I did a good job in adjusting. Tonight it was just nice and solid to get out here and play a decent match and feel like I enjoyed it."

Tsurenko took Barty to three sets when they met in this competition two years ago, but the world number 113 was outclassed on this occasion.

Looking to build on her recent Adelaide International success, Barty eased through the first set as she dropped just 12 points.

Barty was just as dominant in the second set, but she squandered two match points in the sixth game to miss out on a double-bagel to begin her campaign in Melbourne.

Not that it mattered a great deal, though, as the 25-year-old emphatically served out the match to set up a meeting with Italian qualifier Lucia Bronzetti for a place in round three.

DATA SLAM: Barty makes statement start

Barty came through this first-round match with minimal stress and looks in great shape as she bids to become the first Australian to win here since 1978.

The pressure is no doubt on as the pre-tournament favourite, with no top-seeded player in the women's draw failing to make at least round four since Virginia Ruzici in 1979.

WINNERS/UNFORCED ERRORS

Barty – 14/17
Tsurenko – 4/21

ACES/DOUBLE FAULTS

Barty – 5/0
Tsurenko – 0/1

BREAK POINTS WON

Barty – 5/8
Tsurenko – 0/2