The Boston Celtics have had another game postponed after their clash with the Orlando Magic on Wednesday was called off due to the coronavirus pandemic.

The NBA announced the game could not go ahead as planned, just as Sunday's clash with the Miami Heat and Tuesday's planned encounter with the Chicago Bulls could also not be played.

The Celtics would have been without nine players for the Heat game at the weekend, including seven absentees owing to COVID-19 protocols, but at the time they had the minimum eight players available.

It was a contact tracing matter within the Heat camp, after a player reportedly had an inconclusive coronavirus test, that triggered that postponement, but the Celtics' trip to face the Bulls was then also scratched.

On Tuesday, it was announced the Celtics no longer had sufficient players available to form a team.

The NBA said in a statement: "The National Basketball Association game scheduled for tomorrow between the Orlando Magic and Boston Celtics at TD Garden has been postponed in accordance with the league's health and safety protocols.

"Because of testing and contact tracing within the Celtics, the team does not have the league-required eight available players to proceed with tomorrow’s game against Orlando."

Golf superstars including Tiger Woods and defending champion Dustin Johnson are set to play in front of "limited" crowds at the Masters, it was announced on Tuesday.

Last year's tournament was delayed from April to November because of the COVID-19 pandemic, and there were no spectators allowed for that edition of the major at Augusta National.

That is set to change in 2021, says organisers, who are preparing to welcome a small number of Augusta's 'patrons' to watch the action unfold.

Full attendance was ruled out given the continuing need for social distancing, and those allowed entry must adhere to strict health protocols.

Augusta National club chairman Fred Ridley said: “Following the successful conduct of the Masters tournament last November with only essential personnel, we are confident in our ability to responsibly invite a limited number of patrons to Augusta National in April.

"As with the November Masters, we will implement practices and policies that will protect the health and safety of everyone in attendance.

"Nothing is, or will be, more important than the well-being of all involved. While we are disappointed that we will be unable to accommodate a full complement of patrons this year, we will continue our efforts to ensure that all who purchased tickets from Augusta National will have access in 2022, provided conditions improve."

The Masters is scheduled to take place at its Georgia home from April 8 to 11, with Johnson looking to follow up the stunning 20-under-par performance that saw him win a first green jacket.

That was a record score for a champion in the tournament's history and came a year after former world number one Woods landed his 15th major title when he triumphed at the Masters for a fifth time.

Lionel Messi has overcome a knock to be available for Barcelona's Supercopa de Espana semi-final against Real Sociedad as Ronald Koeman looks to take a step closer to his first trophy win as Barca coach.

Messi had, according to Koeman, some "discomfort" after Barca's resounding 4-0 win at Granada on Saturday, the Argentinian scoring twice as both he and the team appeared to be finding their feet again.

That was the Blaugrana's third LaLiga win in a row – all of which came away from home – and they are unbeaten in eight across all competitions since the 3-0 home defeat by Juventus on December 8.

Perhaps unsurprisingly, Barca's improvement has coincided with Messi finding some joy in his game again – the club captain has scored seven times and set up another two in his past seven games, racking up more goal involvements than any other LaLiga player over the same period.

In his 10 previous league games this term, Messi had only contributed to four goals in total – none of which were assists – suggesting his mind was elsewhere following an attempt to leave the club.

But Messi and Barca are looking significantly improved as they head into the Supercopa, with their star man fit for Wednesday's semi-final.

"There are several players with discomfort, one of them is Messi, that is why we withdrew him in Granada," Koeman said on Tuesday. "It seems that everyone is available for tomorrow, also [Ronald] Araujo, although a preparatory session is missing. It is a match against a strong team and we can take the next step."

Koeman recognises Barca have looked more like their old selves in recent weeks, particularly in attack. Since December 9, the four players with the most chances created in LaLiga are Barca players.

"The team is better offensively, we have more players coming from the middle of the field," Koeman said. "We have players in attack who do damage, and defensively the team is working well. We have gained in confidence.

"Lately the team is focused on every game - we have improved in this regard. When we don't have the ball, the team is quite compact. We are improving our game.

"Midfield players give us a lot of threat, but at the beginning of the season we already played with Messi as a false nine. The difference is that the team is more confident and we find free men between the lines."

Wednesday's contest against La Real in Cordoba will be Koeman's first semi-final in charge, with the winners set to play Real Madrid or Athletic Bilbao in the final.

While the Dutchman sees it as a great opportunity for silverware, he does not think victory in this competition will instantly mean Barcelona are back to the levels expected of them.

"For us it is important, Barca is made to win. It is not the most important trophy, but we have to play the semi-final and we will give our best," he said.

"We will play with our best team to be in the final. We want to take the first step to reach it.

"I don't think that winning the trophy means being better. Soccer is fickle and things can change quickly.

"It [winning the trophy] would give us confidence, of course, but we have to go step by step, the first thing is to win the semi-final against Real Sociedad."

Neymar will make his return for Paris Saint-Germain when they take on rivals Marseille in the Trophee des Champions.

PSG will look to win the trophy for a remarkable eighth consecutive season as they line up against Marseille in Lens on Wednesday.

New head coach Mauricio Pochettino confirmed Neymar will play some part in the contest after missing the last five matches with an ankle injury.

"Neymar is available - he will be with the group," Pochettino said about the Brazil forward, who has been out for a month since the Ligue 1 defeat to Lyon.

"We will decide on Wednesday if he will start."

There have been concerns about burnout for Kylian Mbappe, who again played 90 minutes in the 3-0 Ligue 1 win over Brest on Saturday.

But Pochettino is optimistic about the World Cup winner's fitness ahead of a match with high stakes, where the coach feels pride is more important than the silverware on offer.

"Kylian is in perfect condition," Pochettino said when asked if Mbappe could start for a third time in eight days.

"We are evaluating the different options for our line-up on Wednesday. We will see which team is the best to win this match. We need to perform at the best level to get the win against Marseille.

"My main motivation is to win this game. We are playing against a great rival in OM. Pride is important, much more than titles. We will do everything to win this match. 

"If we win, we know it will bring a trophy. But the most important thing is pride."

Asked about his own experiences of Le Classique as a PSG player, Pochettino added: "I remember these meetings perfectly.

"All the games were very special. For the players, the fans, the club, football is a sport of emotions.

"We realise with the health situation how much we miss the fans. The importance of this match, I had already felt it in my time."

Five players were sent off in stoppage time when these two sides met in Ligue 1 in September, following a brawl, but Pochettino sees that having no bearing on this week's game.

"The first match [against Marseille this season] is one I was not involved in. I can't talk much about it. I saw pictures. The situation is over," Pochettino said.

PSG will be without Colin Dagba, the latest player at the club to test positive for coronavirus.

Dagba has started both PSG games under Pochettino, but the defender will not play no part against Andre Villas-Boas' side as he is self-isolating.

Fellow defender Thilo Kehrer and Rafinha have also tested positive for the virus since PSG returned to training this month.

Hansi Flick says Bayern Munich must be wary of a Holstein Kiel side with "nothing to lose" when they meet in the second round of the DFB-Pokal on Wednesday.

Holders Bayern will travel to Holstein-Stadion smarting from squandering a two-goal lead to lose 3-2 against Borussia Monchengladbach in the Bundesliga last Friday.

Kiel are third in 2. Bundesliga and will be eyeing a shock when they take on the European champions for the first time.

Bayern head coach Flick, who is set to welcome the fit-again Serge Gnabry back into his squad, warned the Bavarian giants will be in for a battle against the second-tier side.

He said in a press conference on Tuesday: "Holstein Kiel have got nothing to lose.

"I follow them closely, I know Uwe Stover very well and I've known him for a long time, so naturally I follow their progress more closely.

"Their team has strengthened a lot - they have a clear plan and they like to attack."

Flick added: "We will be taking this task seriously. We are expected to win this game, but it's not always possible to meet these expectations."

Eric Maxim Choupo-Moting misses out with a back injury, while Kingsley Coman will not be risked as Flick revealed the winger is "feeling some discomfort in his muscles." 

Flick will not make a decision on who will make the trip to Kiel until the day of the game.

"We will train as normal on Wednesday ahead of the game, then we will decide who is to travel to Kiel with us," he said.

"There are a lot of games at the moment and we're spending a lot of time in hotels, which is why we're not traveling until matchday."

Colin Dagba is the latest Paris Saint-Germain player to test positive for coronavirus ahead of the Trophee des Champions clash with Marseille.

Dagba has started both PSG games under new head coach Mauricio Pochettino, but the defender will not play no part against Andre Villas-Boas' side at the Stade Bollaert-Delelis in Lens.

The Ligue 1 champions confirmed on Tuesday that Dagba had contracted COVID-19 and is self-isolating.

Fellow defender Thilo Kehrer and Rafinha have also tested positive for the virus since PSG returned to training this month.

Moise Kean, Mauro Icardi and Pablo Sarabia were on target as PSG secured a first win of the Pochettino era on Saturday, beating Brest 3-0 in Ligue 1.

Aryna Sabalenka will face Veronika Kudermetova in the Abu Dhabi Women's Tennis Open after extending her magnificent career-best winning run with a straight-sets victory over Maria Sakkari.

Sabalenka ended 2020 in red hot form and has carried on where she left off at Zayed Sports City International Tennis Centre to stand on the brink of claiming a third successive title.

The fourth seed from Belarus has now won 14 consecutive matches following a commanding 6-3 6-2 success over Sakkari on Tuesday.

Sabalenka reached the 13th WTA singles final of her career at the age of only 22, taking just 57 minutes to see the back of ninth seed Sakkari.

The world number 10 struck 22 winners, eight of which were aces, and made only eight unforced errors, while winning 83 per cent of points on her first serve and will be one to watch at the Australian Open next month.

Kudermetova will be playing in her maiden WTA singles final following a 7-6 (10-8) 6-4 victory over Marta Kostyuk of Ukraine.

Russian Kudermetova came from a break down in the first set and was behind in the tie-break, but dug deep to edge in front in a battle between two unseeded semi-finalists.

The world number 46 broke Kostyuk three times in the second set to secure her spot in the championship match, in which she will have to improve on a first-serve percentage of just 46.5.

Doc Rivers said "nobody's going to feel sorry for us" after the depleted Philadelphia 76ers went down to the Atlanta Hawks on Monday.

The Sixers used nine players in the 112-94 defeat, two more than they had available in the 115-103 loss to the Denver Nuggets.

Ben Simmons (left knee) was again absent, while Tobias Harris, Shake Milton, Matisse Thybulle and Vincent Poirier were left out due to COVID-19 protocols. Seth Curry had also tested positive for coronavirus on Thursday.

For head coach Rivers there are no excuses and he expects plenty of teams to struggle during an unusual NBA season.

"Nobody's going to feel sorry for us. We've got to try to win these games," Rivers said. 

"We're in a tough spot with COVID - not a lot we can do with it. I have a sneaking feeling that there's going to be a lot of teams with this problem. 

"Right now, we're getting hit with it, which is unfortunate for us. It's unfortunate it happened when we had four games in [six] days. 

"It's like the timing of this couldn't have been any worse at all."

Simmons' absence for the Denver game led to the 76ers receiving a $25,000 fine for violating the NBA's injury reporting rules.

Rivers added of Simmons: "We thought it'd be one game and now it's two."

Joel Embiid had 24 points and 11 rebounds after recovering from back tightness.

He played 23 minutes and Rivers explained why Embiid did not spend more time on the court.

"You give yourself a shot, and then as a coach, you've got to assess," he added. 

"Even at half-time for me, I saw what the score was and I didn't think there was much of a chance of us winning that game. 

"My assessment was get everybody out as soon as I could, and you start thinking about the next game." 

The Formula One season will start a week later than originally scheduled in Bahrain after the Australian Grand Prix was put back to November due to the coronavirus pandemic.

Melbourne's Albert Park Circuit was due to stage the opening race of 2021 on March 21, but F1 revealed a revised calendar on Tuesday.

The Bahrain Grand Prix will be the first of the year on March 28, with the event in Australia now taking place on November 21 - subject to World Motor Sport Council approval.

Travel restrictions as a result of the COVID-19 crisis will prevent the Chinese Grand Prix - which was due to be the third round of the season - going ahead on April 11 and no new date has been set for that race.

Imola is back on the calendar for the second race of the campaign on April 18, while there is a spare date in the calendar of May 2 for a race to be staged and a venue for that weekend will be announced in due course.

The season is due to end with a record 23rd race of the year in Abu Dhabi on December 12 and F1 expects fans to return to the grandstands this year.

"It has been a busy start to the year at Formula 1 and we are pleased to confirm that the number of races planned for the season remains unchanged," said president and CEO of Formula 1 Stefano Domenicali.

"The global pandemic has not yet allowed life to return to normal, but we showed in 2020 that we can race safely as the first international sport to return and we have the experience and plans in place to deliver on our season.

"It is great news that we have already been able to agree a rescheduled date for the Australian Grand Prix in November and are continuing to work with our Chinese colleagues to find a solution to race there in 2021 if something changes.

"We are very excited to announce that Imola will return for the 2021 season and know our fans will be looking forward to the return of Formula 1 after the winter break and our revised season opener in Bahrain. Obviously, the virus situation remains fluid, but we have the experience from last season with all our partners and promoters to adapt accordingly and safely in 2021."

F1 2021 calendar in full:

March 28 – Bahrain (Sakhir)
April 18 - Italy (Imola*)
May 2 - TBC
May 9 – Spain (Barcelona)
May 23 – Monaco (Monaco)
June 6 – Azerbaijan (Baku)
June 13 – Canada (Montreal)
June 27 – France (Le Castellet)
July 4 – Austria (Spielberg)
July 18 – United Kingdom (Silverstone)
August 1 – Hungary (Budapest)
August 29– Belgium (Spa)
September 5 – Netherlands (Zandvoort)
September 12 – Italy (Monza)
September 26 – Russia (Sochi)
October 3 – Singapore (Singapore)
October 10 – Japan (Suzuka)
October 24 – USA (Austin)
October 31 – Mexico (Mexico City)
November 7 – Brazil (Sao Paulo)
November 21 - Australia (Melbourne*)
December 5 - Saudi Arabia (Jeddah**)
December 12 - Abu Dhabi (Yas Island)

*Revisions to calendar are subject to World Motor Sport Council approval **Subject to circuit homologation.

LaMelo Ball made more history as the Charlotte Hornets defeated the New York Knicks 109-88 in the NBA on Monday.

Ball became the youngest player in NBA history to record a triple-double on Saturday, and he was at it again for the Hornets – who won their fourth straight game.

The Hornets rookie became the first player aged 19 or younger in league history to lead his team in both rebounds and assists in three consecutive games.

Ball finished with eight points, a career-high 14 rebounds and seven assists as star Hornets team-mate Gordon Hayward posted 34 points, including 28 in the first half.

Two-time reigning MVP Giannis Antetokounmpo returned to help the Milwaukee Bucks past the Orlando Magic 121-99.

Antetokounmpo was in action following a one-game absence due to a minor back injury and scored 22 points, while Bucks team-mate Khris Middleton led the way with 20 points and 10 rebounds.

Brilliant Beal helps snap skid

The Washington Wizards ended their three-game losing streak and claimed their first home win of the season thanks to Bradley Beal's 34 points and a 128-107 victory over the Phoenix Suns. Devin Booker had 33 points for the Suns.

Nikola Vucevic put up 28 points and 13 rebounds for the beaten Magic in Orlando.

The shorthanded Philadelphia 76ers lost 112-94 at the Atlanta Hawks, but Joel Embiid had 24 points and 11 rebounds. Hawks star Trae Young scored 26 points.

Pascal Siakam recorded a triple-double of 22 points, 13 rebounds and 10 assists but the struggling Toronto Raptors still lost 112-111 to the Portland Trail Blazers. CJ McCollum (30) and Damian Lillard (23) combined for 53 points.

Harrison Barnes (game-high 30 points) fuelled the Sacramento Kings' 127-122 win against the Indiana Pacers. Domantas Sabonis posted 28 points and 11 rebounds for the Pacers.

Knicks struggle

It was a forgettable outing for the Knicks, who were just 39.1 per cent from the field and 24.3 per cent from three-point range. New York's Immanuel Quickley made just one of 10 field goals, while he missed all six attempts from beyond the arc for three points in 29 minutes.

Clutch CJ!

McCollum nailed the game-winning shot with 9.6 seconds remaining to lift the Trail Blazers.

Monday's results

Charlotte Hornets 109-89 New York Knicks
Memphis Grizzlies 101-91 Cleveland Cavaliers
Milwaukee Bucks 121-99 Orlando Magic
Washington Wizards 128-107 Phoenix Suns
Atlanta Hawks 112-94 Philadelphia 76ers
Portland Trail Blazers 112-111 Toronto Raptors
Sacramento Kings 127-122 Indiana Pacers
New Orleans Pelicans-Dallas Mavericks (postponed)

Lakers at Rockets

LeBron James and defending champions the Los Angeles Lakers (8-3) will face James Harden's Houston Rockets (3-5) again on Tuesday.

Miami Heat stars Jimmy Butler and Bam Adebayo have been ruled out of Tuesday's scheduled showdown with the Philadelphia 76ers due to the NBA's health and safety protocols amid the coronavirus pandemic.

Butler and Adebayo were added to Miami's COVID-19 protocol list on Monday, joining team-mates Goran Dragic, Kendrick Nunn, Maurice Harkless, Udonis Haslem and KZ Okpala.

Heat guard Avery Bradley had been placed on the health and safety protocols list before Sunday's matchup against the Boston Celtics was postponed.

The coronavirus situation also saw the postponement of Monday's game between the New Orleans Pelicans and Dallas Mavericks, as well as the Celtics-Chicago Bulls encounter on Tuesday.

Miami are ninth in the Eastern Conference with a 4-4 record after reaching last season's NBA Finals, eventually beaten by the Los Angeles Lakers.

The Washington Wizards will be without star Russell Westbrook for at least a week due to a left quadriceps injury.

Westbrook will be re-evaluated at the end of the week after suffering repeated contact to the area since the start of the NBA season, the Wizards announced on Monday.

It is a blow for the Wizards, who have slumped to 2-8 amid high expectations following Westbrook's arrival from the Houston Rockets.

Former MVP Westbrook is averaging 19.3 points, 11.3 assists and 9.7 rebounds per game in seven appearances for the Wizards this season.

Westbrook has already made some history since swapping the Rockets for the Wizards in a blockbuster trade.

The nine-time All-Star joined Hall of Famer Oscar Robertson as the only players in NBA history to open a season with four triple-doubles in their first four games.

Brooklyn Nets star Kyrie Irving will miss his fourth consecutive game, the NBA franchise announced on Monday.

Irving has been sidelined due to personal reasons and his absence will continue for Tuesday's clash with the Denver Nuggets.

When asked for an update on Irving's status, Nets head coach Steve Nash told reporters: "I do not have any updates, sorry".

While star team-mate Kevin Durant returned in Sunday's loss to the Oklahoma City Thunder, NBA champion and six-time All-Star Irving was missing once again.

Irving is averaging 27.1 points, 6.1 assists and 5.3 rebounds per game in Brooklyn this season.

The Nets (5-6) have lost back-to-back games to sit 10th in the Eastern Conference, behind the eighth-placed Charlotte Hornets (5-5).