Pat Cummins was the victim of "really, really bad luck" as Australia's captain was forced to miss the second Ashes Test and go into isolation.

That was the verdict of Cricket Australia CEO Nick Hockley, who said the team had no option but to go into the Adelaide clash against England without their new skipper.

Cummins was dining at a restaurant on Tuesday and sat nearby to someone who has since been confirmed as a positive coronavirus case.

The star paceman did not breach any biosecurity protocols and isolated as soon as he became aware of the situation. Cummins has since had a PCR test, which produced a negative result, and said he was "gutted" to be ruled out of action. Michael Neser came in for his debut, replacing Cummins.

What it means for Cummins is that he could only watch on television as Australia made a bright start against England, reaching 211-2 in 78 overs as the first day continued to unfold.

Hockley said on BT Sport: "It's certainly been eventful, and it's so disappointing that Pat was ruled out as a close contact last night

"No one's more disappointed than Pat and everyone's been working extremely hard overnight to get the facts, and ultimately it was determined, working with the health authorities, that he had been in close contact with a positive case. It's just really 'wrong time, wrong place', and it's really, really bad luck. We're thrilled that he's going to be fit and raring to go on Boxing Day.

"We worked to establish the facts. We worked closely with SA [South Australia] Health. Ultimately, if you do become a close contact then the rules are to isolate for seven days, so there was really no option in the end.

"We've got protocols in place to make sure that multiple players don't get tied up in that situation, so they have to dine in small groups. If there's one consolation, it's that everyone else is available to play."

Hockley said Cummins should be available for the next match at the Melbourne Cricket Ground, and measures were being taken to ensure he can stay fully fit.

"He's in isolation now. He's watching the cricket," Hockley said.

"We'll be putting plans in place plans to make sure that when people are in isolation they get access to the right fitness equipment, and we all want to make sure he keeps his conditioning up to a level and that he's in optimum condition for the Boxing Day Test."

Steve Smith captained Australia in the absence of Cummins as the day-night Test got under way.

Mercedes have withdrawn their appeal against the result of Sunday's contentious Abu Dhabi Grand Prix that saw Max Verstappen pip Lewis Hamilton to the Formula One drivers' title.

Hamilton had built up a healthy lead over his Red Bull rival in the season finale, with both men having entered the race level on points, until a controversial late safety car period was followed by Verstappen overtaking the Mercedes driver on the final lap.

The German constructors launched two challenges that were both rejected by the FIA, with Mercedes giving notice of an intention to appeal.

However, the team said in a statement they will not proceed down that route following discussions with F1 and governing body the FIA.

Mercedes said: "We left Abu Dhabi in disbelief of what we had just witnessed. Of course, it's part of the game to lose a race, but it's something different when you lose faith in racing.

"Together with Lewis, we have deliberated carefully over how to respond to the events at the Formula 1 season finale. We have always been guided by our love of this sport and we believe that every competition should be won on merit.

"In the race on Sunday many felt, us included, that the way things unfolded was not right. The reason we protested the race result on Sunday was because the safety car regulations were applied in a new way that affected the race result, after Lewis had been in a commanding lead and on course to win the world championship.

"We appealed in the interest of sporting fairness, and we have since been in a constructive dialogue with the FIA and Formula 1 to create clarity for the future, so that all competitors know the rules under which they are racing, and how they will be enforced.

"Thus, we welcome the decision by the FIA to install a commission to thoroughly analyse what happened in Abu Dhabi and to improve the robustness of rules, governance and decision making in Formula 1. We also welcome that they have invited the teams and drivers to take part.

"The Mercedes-AMG Petronas team will actively work with this commission to build a better Formula 1 – for every team and every fan who loves this sport as much as we do. We will hold the FIA accountable for this process and we hereby withdraw our appeal."

Hamilton had built up an 11-second advantage over Verstappen, but the race swung in dramatic circumstances when the Williams of Nicholas Latifi crashed into the barriers four laps from the end, presenting Verstappen with a chance to pit for fresh tyres.

An opportunity to make the pass presented itself when race director Michael Masi controversially ruled lapped cars could overtake the safety car before it headed back to the garage to leave one final lap of racing between the contenders.

Verstappen made the pass, with Masi later telling Mercedes team boss Toto Wolff: "We went car racing."

Hamilton is thought to have been the key influencer in Mercedes' decision, with the seven-time champion said to have wanted to avoid the destination of the title being decided in the courts.

Mercedes continued their statement with a gracious statement to first-time champion Verstappen, while hailing the continued excellence of Hamilton, who was this week knighted in the United Kingdom.

"To Max Verstappen and Red Bull Racing: we would like to express our sincere respect for your achievements this season. You made this Formula 1 Championship title fight truly epic," they added.

"Max, we congratulate you and your entire team. We look forward to taking the fight to you on the track next season.

"And lastly, even though this drivers' championship did not end the way we hoped, we could not be prouder of our team.

"Lewis, you are the greatest racer in the history of Formula 1 and you drove your heart out for every lap of this incredible season. You're a flawless sportsman on and off the track and you delivered a faultless performance.

"As a pure competitor and as a role model for millions around the world, we salute you."

Austin Reaves admits he had always been the underdog on his way to the NBA, but for one night at least he was the hero for the Los Angeles Lakers.

The 23-year-old rookie earned a spot in the Lakers set-up after impressing in the Summer League, and now he is showing up as a big-league prospect, hitting the winning three-pointer against the Dallas Mavericks on Wednesday night with 0.9 seconds left in overtime.

Reaves posted an NBA career-best 15 points and seven rebounds, making five of six three-point shots, earning high praise from superstar team-mate Anthony Davis after the Lakers' 107-104 win.

Davis said: "It's testament to the hard work he's putting in. He's a sponge. He's soaking up all the information that we give him. He wants to learn, he wants to get better.

"He's not afraid of the moment. He's a hard worker. He plays hard, does the right things. Even when we get on him during a game, he's right here accepting the criticism, accepting the help, and applying it on the floor."

LeBron James scored a team-high 24 points, adding three rebounds and five assists, but missed a last-gasp three-point attempt in normal time. The Mavs fumbled the rebound and Wayne Ellington swooped to hit a triple to send the game overtime.

Russell Westbrook (23 points, 10 rebounds and nine assists) came up with a clutch three-pointer in overtime, while Davis had 20 points and 12 rebounds.

Both sides traded triples in overtime, but shooting guard Reaves stepped up for the game-winning basket after being found by Westbrook wide open, lifting the Lakers to a 16-13 record with their third straight win.

"Great pass by Russ, great shot by Austin," Davis said. "Didn't even hit the net, it was a huge, huge shot for him."

It was described as "a hell of a shot" by coach Frank Vogel.

Reaves, roared into the locker room by team-mates and drenched in water as a prank, reflected on a tough journey to this moment in his career.

He said: "It's been the story of my life, I've always been under-rated. But at the end of the day you've got to produce on the basketball court 

"For me to hit that shot and for my team-mates to have the trust in me to take that shot is very, very special."

The Lakers had players sidelined by COVID-19 protocols, in a sign of the times for the NBA.

James said the team were "kind of living in the moment right now" in that regard.

"There's been a lot going on," he said. "We have a lot of injuries, a lot of mixed line-ups, a lot of guys in protocols, false protocols, things of that nature, so we are what we are as a team right now, and we like where we’re at."

Urban Mayer has been sacked as Jacksonville Jaguars head coach after only 13 games in charge ending a tumultuous tenure.

Mayer's dismissal was confirmed by Jaguars owner Shad Khan on Wednesday with the side sitting 2-11 on a five-game skid and in bottom spot in the AFC South.

The former Ohio State head coach's brief time in charge as the Jaguars, having been hired in January, was riddled with issues, including a video surfacing showing a woman dancing close to him in Ohio in October.

Last week there were reports of tension between Mayer and the Jaguars players and coaches, including the latest on Wednesday claiming that former kicker Josh Lambo alleged the head coach had kicked him in the leg while stretching in warm-ups prior to a practice, which was the final straw for Khan.

"After deliberation over many weeks and a thorough analysis of the entirety of Urban's tenure with our team, I am bitterly disappointed to arrive at the conclusion that an immediate change is imperative for everyone," Khan said in a statement.

"I informed Urban of the change this evening. As I stated in October, regaining our trust and respect was essential. Regrettably, it did not happen."

Darrell Bevell will serve as interim head coach, while Trent Baalke will continue as general manager.

Khan added: "In the spirit of closure and recharging our players, staff and fan base, I will not comment further until some point following the conclusion of the NFL season."

The Los Angeles Lakers claimed a remarkable 107-104 overtime win over the Dallas Mavericks with rookie Austin Reaves clinching the game with a late three-pointer.

LeBron James finished with 24 points, three rebounds and five assists but missed a last-gasp three-point attempt in normal time, but the Mavs fumbled the rebound and Wayne Ellington swooped to hit a triple to send the game overtime.

Russell Westbrook (23 points, 10 rebounds and nine assists) came up with a clutch three-pointer in overtime - his only of the game - while Anthony Davis had 20 points and 12 rebounds to lift the Lakers to a 16-13 record with their third straight win.

Both sides had traded triples in overtime but 23-year-old shooting guard Reaves stepped up with scores locked at 104-104 after being found by Westbrook wide open, draining his three-point attempt with 0.9 seconds on the clock.

The Lakers surrendered a good start with a poor second quarter, where the Mavs outscored them 27-14, but defensively were excellent keeping Dallas, who were without Luka Doncic, to 27.3 percent shooting from beyond the arc.

Good Holiday with others out

Jrue Holiday stepped up in the absence of Khris Middleton (knee) and Giannis Antetokounmpo (COVID protocols) with 26 points and 14 assists to lead the Milwaukee Bucks past the Indiana Pacers 114-99. Tyrese Maxey had a game-high 27 points for the 76ers.

Reigning MVP Nikola Jokic continued his hot run with another triple-double (27 points, 10 rebounds and 11 assists) but the Denver Nuggets lost 124-107 to the Minnesota Timberwolves, as Anthony Edwards scored 10 triples in his 38 points.

The Utah Jazz stretched their winning streak to eight games, beating the Los Angeles Clippers 124-103 with Rudy Gobert (20 points and 17 rebounds) and Donovan Mitchell (27 points and six assists) starring.

Devonte' Graham drained a 65-foot game-winning buzzer beater as the New Orleans Pelicans defeated the Oklahoma City Thunder 113-110, while Gordon Hayward scored 41 points from 29 minutes on court as the Charlotte Hornets beat the San Antonio Spurs 131-115.

Embiid loses his touch

Joel Embiid missed a late three-point chance to tie the game and shot five of 13 from the field for his 17 points as the Philadelphia 76ers lost 101-96 to the weakened Miami Heat, who were without Jimmy Butler, Bam Adebayo and Tyler Herro. Gabe Vincent landed seven three-pointers in his career-high 26-point haul for the Heat.

World number four Karolina Pliskova has withdrawn from the upcoming Australian Open, succumbing to a hand injury.

Pliskova – a two-time grand slam runner-up and 2019 Australian Open semi-finalist – hurt her hand in a practice session.

The 16-time WTA Tour champion will miss the main draw of the year's opening slam event, which gets underway on January 17, for the first time since failing to progress beyond qualifying in 2012.

"Unfortunately I hurt my right hand in practice yesterday and I won't be able to play in Adelaide, Sydney and Australian Open this year," Czech star Pliskova said.

"I am sad not being able to start my season in Australia and I will miss my Australian fans very much."

Australian Open officials also confirmed Pliskova's absence on Thursday.

"You will be missed, @KaPliskova. Wishing you a speedy recovery," the Australian Open wrote via social media.

Pliskova lost in the Australian Open third round at Melbourne Park earlier this year before falling at the second hurdle at the French Open.

The 29-year-old then reached the Wimbledon decider, trumped by world number one Ash Barty, followed by a quarter-final appearance at the US Open.

Milwaukee Bucks star Khris Middleton missed Wednesday's win over the Indiana Pacers, however the reigning NBA champions are hopeful his knee injury is a short-term problem after positive MRI results.

Middleton had warmed up prior to the 114-99 victory, but did not take his place in the side missing seven players, including superstar Giannis Antetokounmpo – who entered COVID-19 protocols on Tuesday.

Bucks small forward Middleton had hyperextended his left knee in Monday's 117-103 loss to the Boston Celtics and was forced out of the contest.

Milwaukee head coach Mike Budenholzer confirmed Middleton had undergone an MRI which offered reason for encouragement.

"I think we consider everything very fortunate," Budenholzer told reporters. "This should be very minimal and short. We'll see how he feels [Thursday] and going into the game Friday, I think we'll be hopeful."

Antetokounmpo joined Wes Matthews and Donte DiVincenzo in being unavailable due to entering league protocols.

To clear protocols, a player must be out for a minimum of 10 days or return two negative PCR tests at least 24 hours apart.

"We'll follow all the guidelines that the league has laid out," Budenholzer said. "Hope he's just healthy and taking care of himself."

Australian captain Pat Cummins has sensationally been ruled out of the second Ashes Test against England, deemed a close contact of a person who received a positive COVID-19 test.

The news comes on the morning of the first day of the pink-ball Test at Adelaide Oval, with Queensland fast bowler Michael Neser confirmed to replace Cummins in the XI for his debut on Thursday.

Former skipper Steve Smith will captain Australia in the absence of Cummins in the day-night Test in Adelaide.

Cummins was dining at a restaurant on Tuesday and was sat nearby to someone who has since been confirmed as a positive coronavirus case.

The star paceman did not breach any biosecurity protocols and isolated as soon as he became aware of the situation. Cummins has since had a PCR test, which produced a negative result.

However, Cummins has been confirmed as a close contact by South Australia Health and will be required to isolate for seven days, ruling him out of the second showdown with rivals England.

Cricket Australia (CA) said it anticipated Cummins will be available to play in the Boxing Day Test at the MCG in Melbourne.

"Cummins is understandably very disappointed not to be able to captain Australia for the day-night Test in Adelaide," CA said in a statement.

The 28-year-old fast bowler had led Australia to a nine-wicket victory in the Ashes opener as skipper in Brisbane, after taking over from Tim Paine.

Smith's deputising marks the first time he will have captained his country since the controversial 2018 sandpaper-gate Test match in Cape Town, which led to his dismissal as skipper and 12-month suspension.

Australia may have dodged a further bullet, revealing Mitchell Starc and Nathan Lyon were also dining at the same restaurant but at a separate table outdoors.

Both have been deemed casual contacts by SA Health and are free to play.

Fiorentina director Joe Barone insisted the club will not increase their offer to wantaway star Dusan Vlahovic as he called for respect.

Vlahovic is set to leave Fiorentina after opting against signing a new deal in Florence, with the Serbia international's current contract expiring in June 2023.

The 21-year-old – who has a league-high 15 goals this term – has been linked to Serie A champions Inter, Juventus, Premier League holders Manchester City, Manchester United, Bundesliga winners Bayern Munich, LaLiga titleholders Atletico Madrid, Tottenham and Arsenal.

Amid the growing speculation, Vlahovic has continued to flourish for Fiorentina in Serie A this season.

Vlahovic (32) is only the third player in the last 60 years to have scored more than 30 Serie A goals in a single calendar year, after Cristiano Ronaldo (33 in 2020) and Luca Toni (31 in 2005).

He is also the first Fiorentina player to have found the net in five consecutive Serie A appearances since Alberto Gilardino in 2008, while Vlahovic is the youngest player to have scored at least 15 goals in his club's first 17 Serie A seasonal matches since Altafini and Antonio Valentin Angelillo, both in the 1958-59 campaign.

But Fiorentina have no plans to raise their contract offer, according to Barone.

"We made our proposal and it will not change. Both Dusan and his agents did not accept," Barone told Mediaset prior to Wednesday's Coppa Italia win over Benevento.

"People ought to have recognition for an environment that gave them so much.

"Our proposal increased and increased, but at a certain point we had to set a limit.

"This club used to have €90million revenue and now after COVID and various other issues, it's around €72m, so we must take that into account.

"There are limits, there must be respect for the group and there are areas where Fiorentina simply cannot go."

Lamar Jackson has not practiced this week due to his ongoing ankle injury, but the Baltimore Ravens are not ruling the star quarterback out of Sunday's game against the Green Bay Packers.

Jackson suffered an ankle sprain in Baltimore's 24-22 NFL defeat to the Cleveland Browns last week, having been doubtful heading into the contest.

The former MVP threw only four passes for 17 yards before taking a hit in the first play of the second quarter and being replaced by Tyler Huntley.

Ravens head coach John Harbaugh has been bullish all week about Jackson's availability to face Aaron Rodgers' high-flying Packers, despite not practicing and offered an update on Wednesday.

"It's day-to-day right now. We've just got to see how it responds," Harbaugh told reporters on Wednesday. "He's not going to practice today, but we'll see going forward how that goes."

Jackson's injury is not a high ankle sprain, offering hope of a quick recovery and Harbaugh had said on Monday that "the plans are right now, in my mind, for Lamar to be out there."

Harbaugh confirmed if Jackson was declared fit, the Ravens would not rest him with a view to their crunch divisional Week 16 game against the Cincinnati Bengals.

"I would say that factors zero percent [into the decision]," Harbaugh said. "We're trying to win this game. Every win right now is… you want every win you can get."

Jackson is enjoying a strong season for the Ravens, completing 242 of 378 passes for 2,865 yards with a 64 percent completion rate for 16 touchdowns. He has also allowed 13 interceptions, having only committed 18 across his previous three seasons.

Baltimore lead the AFC North with an 8-5 record, narrowly ahead of the Bengals (7-6) and Browns (7-6) with four regular-season games remaining.

The Ravens have lost back-to-back games for the first time this season, losing by one point against the Pittsburgh Steelers and by two points against Cleveland. According to Stats Perform, it is the first time in franchise history Baltimore have lost consecutive games by two points or fewer.

The FIA says the fallout from the controversial ending to Sunday's Abu Dhabi Grand Prix is "tarnishing the image of the Championship" and will subsequently conduct an analysis and clarification exercise.

Max Verstappen was crowned Formula 1 world champion after a stunning final-lap overtake of title rival Lewis Hamilton – the pair were level on points heading into the season-ending GP.

Verstappen had trailed defending F1 champion Hamilton by more than 10 seconds with 10 laps remaining, but was offered an avenue to victory following the lap-53 deployment of the Safety Car after Nicholas Latifi's crash.

The Dutchman overtook Hamilton on the final lap after being permitted to move past five lapped cars between them to sit on his rival's tail with fresher tyres, having pitted before the safety car moved aside. It caused confusion and protestations from Hamilton's team Mercedes. Both official protests were dismissed by stewards.

In a statement issued after a planned meeting of its World Motor Sport Council on Wednesday, the FIA said Verstappen's success was being overshadowed by the "argument that is currently tarnishing the image of the Championship".

It also stated that outgoing FIA president Jean Todt wanted further discussion to provide clarity for teams and drivers before the 2022 season.

"The FIA's primary responsibility at any event is to ensure the safety of everyone involved and the integrity of the sport," read a statement.

"The circumstances surrounding the use of the Safety Car following the incident of driver Nicholas Latifi, and the related communications between the FIA Race Direction team and the Formula 1 teams, have notably generated significant misunderstanding and reactions from Formula 1 teams, drivers and fans, an argument that is currently tarnishing the image of the Championship and the due celebration of the first Drivers' World Championship title won by Max Verstappen and the eighth consecutive Constructors' World Championship title won by Mercedes.

"Following the presentation of a report regarding the sequence of events that took place following the incident on Lap 53 of the Grand Prix and in a constant drive for improvement, the FIA President proposed to the World Motor Sport Council that a detailed analysis and clarification exercise for the future with all relevant parties will now take place.

"This matter will be discussed and addressed with all the teams and drivers to draw any lessons from this situation and clarity to be provided to the participants, media, and fans about the current regulations to preserve the competitive nature of our sport while ensuring the safety of the drivers and officials. It is not only Formula 1 that may benefit from this analysis, but also more generally all the other FIA circuit championships.

"Following that presentation and an extensive discussion, the World Council has decided to unanimously support the President’s proposal."

Mercedes have since lodged a notice of an intention to appeal and must notify the FIA by Thursday if they plan to take it on to the International Court of Appeal.