Philadelphia 76ers head coach Doc Rivers remains unsure if Ben Simmons will feature in the team's NBA season opener against the New Orleans Pelicans on Wednesday.

Simmons demanded a trade amid criticism following last season's playoff exit to the Atlanta Hawks and was absent from Philadelphia for the first two weeks of preseason work before showing up on October 11 to begin fulfilling COVID-19 protocols that would allow him to re-join the championship-chasing franchise.

As the 76ers – who claimed the Eastern Conference top seed in 2020-21 – gear up for the new season, Rivers was again asked about Simmons' availability.

"I have no idea," Rivers told reporters after Simmons participated in practice on Monday. "Honestly, I haven't even thought about it much.

"When it comes, I'll make the decision. But I'm just going to wait and see and watch. The spirit has been so good, and so we’re just going to keep going."

"Just learning the new stuff, conditioning, timing, rhythm," Rivers said.

"We've been together for three weeks, so we've established a good rhythm. So the more he's been in, the more he does, especially when we're working on our offensive stuff earlier, because we've built from last year but we tweaked a lot of stuff. But it's easy to pick up, especially for him."

Simmons – an elite defender – and his shooting problems were laid bare during the 2021 postseason with the top-seeded 76ers, who were eliminated in the semi-finals.

Former number one draft pick Simmons had no fourth-quarter field-goal attempts in his last four games of the playoffs against the Hawks last season. He is the only NBA player in the last 20 seasons to have four consecutive postseason games with no field-goal attempts in the fourth quarter during a season in which he was an All-Star, according to Stats Perform.

Simmons averaged just 10.1 field-goal attempts in 2020-21 – a career low, which dropped to 7.9 in the playoffs. It was the same story with his scoring as it dropped to a career-worst 14.3 points per game and 11.9 in the postseason – both career lows.

Then there is Simmons and free throws. He was exposed by rival teams as they regularly sent him to the line, with the Melbourne-born guard making just 25 of 73 shots in the 2020-21 playoffs. His 34.2 free-throw percentage is the lowest ever in a single postseason.

On chemistry, Rivers added: "It'll grow. It'll come back. I'm not that concerned, right now, with it. They are interchanging, it's coming, and it just takes time.

"Chemistry is huge, and I think overall our chemistry is phenomenal right now and we want to keep it going."

The Milwaukee Bucks will raise their 2021 title banner and receive their championship rings on Tuesday, just before a season opener against a Brooklyn Nets team missing a star player they hoped would deliver silverware to their franchise.

Milwaukee defeated Brooklyn in a seven-game Eastern Conference semi-finals series en route to their first NBA title in 50 years last term.

It was an engrossing series in which Milwaukee prevailed largely due to their superior health, the Nets' cause hindered by injury struggles for James Harden and Kyrie Irving.

And they will again be minus Irving for the season opener in Wisconsin, though for a markedly different reason.

Irving's refusal to receive a coronavirus vaccine, and the fluctuations in his ability that would cause with mandates in major cities preventing unvaccinated individuals from entering public spaces, led the Nets to decide he will not play for the team until the issue is resolved.

As a result, much of the burden will again fall on Kevin Durant, though he will at least have the assistance of Harden, as the Nets aim to get a measure of revenge on Giannis Antetokounmpo and the Bucks.

Even with Irving out of the picture, the Nets look set to contend with the Bucks for superiority in the East, and this encounter may provide an early indication of which team has the upper hand in 2021-22.

PIVOTAL PERFORMERS

Milwaukee Bucks – Jrue Holiday 

While Antetokounmpo is the man around whom everything revolves for the Bucks, he receives substantial support from Khris Middleton and Jrue Holiday.

It is the latter who is the chief facilitator for Milwaukee. Holiday's 10.5 assists per 48 minutes last postseason ranked fifth among players to play in at least 10 playoff games.

The Bucks will look for him to have a similar influence on their title defence, starting with the visit of the Nets.

Brooklyn Nets – James Harden

Harden was in the MVP conversation last season until a hamstring issue derailed his campaign.

His one full regular-season appearance against the Bucks saw him post a double-double with 34 points and 12 assists.

With Irving unavailable, getting that kind of performance from Harden would be critical to the Nets' hopes of opening the season on a high.

KEY BATTLE – Giannis vs. KD

Though both teams have plenty of depth at their disposal, the unquestioned headline act of the season opener will be the heavyweight matchup between Antetokounmpo and Durant.

Last season, the All-Star duo definitely brought out the best in each other.

In 10 games against the Nets across the regular season and postseason, Antetokounmpo only once scored fewer than 30 points. He averaged 61.5 points/assists/rebounds per 48 minutes and had an effective field goal percentage of 57.9.

In three of those games, Durant went over 40 points, with the two-time Finals MVP averaging 58.5 points/assists/rebounds per 48 minutes and posting an effective field goal percentage of 55.6.

However, Durant's plus-minus across all meetings with the Bucks was minus 18 compared to plus 26 for Antetokounmpo, perhaps speaking to his lack of support in the postseason.

With Harden in his corner for this contest, Durant will hope to flip the script in that regard and spoil the Bucks' celebration.

HEAD TO HEAD

The Bucks will be confident they have the edge after their postseason defeat of the Nets and also won each of their home games against Brooklyn last season. A momentous night of celebration for Milwaukee is not the time to let their advantage slip.

The NBA and its leading stars will hope the coming regular season is exactly that: regular.

The past two have not been. In 2019-20, the season was paused for the coronavirus pandemic and resumed in Orlando, in a bubble and without crowds.

Giannis Antetokounmpo was at least able to put forward his claims for a second straight MVP honour prior to that point.

In 2020-21, a rapid turnaround from the playoffs appeared to catch some leading men out, before the brutal 72-game December-to-May calendar saw a number of top performers face spells on the sidelines.

As a result, Nikola Jokic was the clear MVP candidate, outstanding for the Denver Nuggets but crucially also one of just 11 players across the league to play in all 72 games. His 2,488 minutes trailed only New York Knicks pair Julius Randle (2,667) and RJ Barrett (2,511).

With a proper preseason to plan – and the Nuggets hurt by Jamal Murray's injury – it seems unlikely Jokic will defend his title.

But which players are most likely to follow his lead and move clear of the rest in the coming months? Stats Perform breaks down the chances of the MVP favourites.

Giannis Antetokounmpo

Having claimed back-to-back MVP Awards, Antetokounmpo entered preseason last year as the favourite again and threatened for a time to contend, averaging 28.1 points, 11.0 rebounds, 1.2 blocks and 1.2 steals per game. A six-game lay-off in April, immediately after scoring 47 points in Portland, put paid to those hopes.

However, it would have been tough for voters to justify again picking Antetokounmpo regardless. At that stage, he had won only three playoff series in his entire career. By contrast, Bill Russell, Wilt Chamberlain and Larry Bird – the three men previously honoured three years in a row – each celebrated at least one championship across the first two seasons of their respective runs.

It is very different now, though. Although Antetokounmpo would become only the ninth player to take the Maurice Podoloff Trophy on three occasions, there is less daunting historical precedent with the lean year in between. Crucially, too, the 'Greek Freak' is now himself a champion.

Antetokounmpo was the Milwaukee Bucks' Finals MVP as they won their first title in 50 years. Rather than regress in the playoffs – his points average had dipped from the regular season in four of his five prior postseason campaigns – the 26-year-old forward scaled new heights, taking more responsibility with a career-high 20.9 field goal attempts per game and being rewarded with 30.2 points.

Now embracing his strengths, taking only 3.3 shots from three-point range in the postseason and shooting 73.6 per cent at the rim, Antetokounmpo should have the confidence to kick on again.

Luka Doncic

It is Doncic, not Antetokounmpo, who has been installed as the early favourite this year. The Slovenian is only entering his fourth season, but it feels about time he truly established himself as a future great.

Doncic was one of those who acknowledged he was "not in my best shape" as the 2020-21 season promptly got under way, and the Dallas Mavericks were an underwhelming 8-12 at the end of January, although the point forward still averaged 27.4 points over that slow early period. He then weighed in with 30.3 points across 12 games in February.

Only four players bettered Doncic's 1,830 points come the end of the year, yet he could still be a little more consistent in pursuit of a regular-season award. The 22-year-old has set an astonishing standard on the biggest stage. While waiting on a first series win, his 33.5 playoff points are the most by any player to feature in at least 13 career games. Doncic's 143 points at the Tokyo Olympics led the tournament.

If Dallas can be competitive from the outset, Doncic's game is certainly a good fit for individual recognition, his 2020-21 usage rate of 36.0 per cent the highest among players with 500 or more possessions. Similarly dominant for Slovenia, his 57 assists and 196 minutes also topped the charts at the Olympics.

New coach Jason Kidd will ask "young Picasso" Doncic to share the ball around a little more this year, though, saying: "As a coach, I don't know if anybody told Picasso that he had to use all the paints. But I just want to remind Luka that he can rely on his team-mates, and his team-mates are going to be there to help him."

He added: "We know that it's easy to get the ball to Luka, but the one thing we do want to get accomplished is other guys as playmakers so come the fourth quarter Luka is fresh and is ready to deliver." Some more big moments – Luka's 93 clutch points ranked 21st last year – would certainly help Doncic's cause.

Stephen Curry

The Los Angeles Lakers' new 'big three' – we will come to the Brooklyn Nets shortly – is likely to help title hopes but hinder MVP bids. Russell Westbrook's relentless regular-season efforts, averaging 34.4 per cent usage over the past seven seasons, might take some of the shine away from LeBron James. Curry does not have that problem.

As last year, when he had the next-most first-place votes after Jokic (albeit just five to 91), the Golden State Warriors are set to be hugely reliant on Curry – at least until fellow Splash Brother Klay Thompson is back from injury.

In his first full season since Kevin Durant left and Thompson went down, Curry set his stall out early with 62 points against the Portland Trail Blazers but saved his best for the end of the year, averaging 36.9 points after a tailbone injury in March to take a second scoring title. The two-time MVP could not quite do enough to carry the Warriors through the play-in round.

A young supporting cast is now another year older, however, meaning Golden State should be competitive enough to keep Curry in the limelight without having enough talent to distract from his displays.

Only Thompson's return is likely to alter the pattern of play after Curry set career highs in points (32.0), rebounds (5.5), field goal attempts (21.7), three-point attempts (12.7), foul line visits (6.3) and usage rate (34.7). He scored a league-high 24.6 per cent of the Warriors' points.

Kevin Durant

Durant, like James, was set to merely be the biggest star on a team of stars until the complications around Kyrie Irving's status arose. As it stands, Irving will not feature for the Nets due to his refusal to get a coronavirus vaccine that would allow him to play home games.

Of course, Brooklyn also have James Harden, who briefly flirted with the MVP picture last year prior to a hamstring injury, but Durant will be the team's go-to as long as he stays on the court.

Although Durant made only 32 starts in 35 games in 2020-21, he led the Nets in points per game (26.9) and usage rate (31.1). Irving ranked second in both categories (also 26.9 points per game, 30.5 per cent usage).

The former Warrior is now another year on from his awful Achilles injury and gave an indication in the playoffs of the player he can still be. Playing in all 12 games, unlike Harden and Irving, Durant scored an outstanding 34.3 points – a league best among those to play 10 or more games. Only a borderline call on a Durant shot in Game 7 against the Bucks ended Brooklyn's campaign.

With or without Irving, the Nets are expected to contend for the title this time. Durant was Finals MVP in his two championship triumphs in 2017 and 2018 but has only a single regular season award, back in 2013-14. If he is back to his best, as would appear to be the case, the 33-year-old could dominate the coming season from start to finish.

Joel Embiid

Should, as this list suggests, voters look for players who are capable of putting their teams on their backs, Embiid's case has only got stronger.

The big man was already the Philadelphia 76ers' key performer, evidenced by their 39-12 record with him in the team last year compared to 10-11 when he was missing. Indeed, had Embiid not been absent for such a number of games, he might well have pipped Jokic to the top individual award.

Jokic clearly had the edge as a creator, his 8.3 assists per game allowing him to tally 16 triple-doubles, Embiid actually averaged more points (28.5 to 26.4) and his prowess on defense (including 1.4 blocks per game) contributed to far superior numbers in terms of plus/minus (7.9 to 5.3) and defensive rating (103.1 to 109.2).

Ben Simmons, the Sixers' second man, was already underwhelming last year, and Embiid's responsibilities on both ends of the floor are set to increase due to the uncertainty surrounding his team-mate.

Even if Simmons sticks around, as is now a possibility, this is clearly Embiid's team. He felt it had not been previously, responding to reports Simmons was unhappy with the dynamic by saying: "I feel like our teams have always been built around his needs." Those claims were "disappointing" and "borderline kind of disrespectful", Embiid added.

He will certainly not be lacking motivation now to put his injury woes behind him, enjoy another outstanding season and claim the MVP award that evaded him last year.