Top-ranked star Iga Swiatek remarked in September that she feels the season is "too long and too intense."
After Daria Kasatkina ended her 2025 season ahead of schedule in October, the one-time elite competitor described how she had "encountered a barrier."
"The schedule is too much. Mentally and emotionally I'm at breaking point, and, sadly, I'm not alone," she stated.
Elina Svitolina of Ukraine, a two-time Wimbledon semi-finalist, had previously revealed she was not in "the mental space" to continue, while current Grand Slam champions Iga Swiatek and Carlos Alcaraz furthermore think the calendar is excessively lengthy.
This issue is still being argued as the world's foremost tennis players gather again in Australia for the beginning of the 2026 season.
A somewhat extended off-season than 2025 has been welcomed. However, a few weeks is not seen as enough time for adequate recuperation before training starts for an eleven-month schedule regarded as among the most onerous in professional sport.
"Tennis places greater strain on athletes now than it ever has," commented Dr. Robby Sikka, head of medicine at the Professional Tennis Players' Association (PTPA).
"Matches and rallies are longer, players are faster, they're hitting the ball harder.
"We have a duty to safeguard our athletes and give them a more viable sport."
So what measures are in place and what additional measures could be taken?
The 2025 season spanned 47 weeks for many male competitors, commencing with the United Cup team event in late December 2024 and finishing with the Davis Cup final in late November.
The WTA Tour season finished two weeks earlier when the WTA Finals wrapped up in early November. The governing body moved the Billie Jean King Cup Finals forward to September to help combat scheduling concerns.
The ATP Tour says it does not take the concerns of the players "lightly," while the WTA Tour says player welfare will "consistently be the foremost concern."
That did not placate the PTPA, which began legal action against the men's and women's tours in March, pointing to "anti-competitive practices and a blatant disregard for player welfare."
Overhauling the calendar is an clear answer but cannot be accomplished simply given the complicated structure of tennis governance, where the four Grand Slams, ATP, WTA, and ITF each have controlling interests.
"We need to think about whether we can buy back time at the end of the year for an longer break, or can we allow for a pause during the season so there is a short hiatus," noted Dr. Sikka.
Former world number one Andy Roddick, a long-time advocate for change, says the season should not go past 1 November.
The ATP Tour has decreased the number of events which are included in the rankings for 2026, which it believes will reduce "the total burden" on the players.
"One point that often gets overlooked: players determine their own playing calendar," stated ATP chairman Andrea Gaudenzi.
"Such autonomy is uncommon in elite athletics. But with that comes obligation - understanding when to compete and when to rest."
Stretching several required events across a fortnight - creating so-called 'mini Slams' - has also been criticized.
"In my view, athletes are more psychologically drained and exhausted because they're away from home for extended periods," opined Britain's former men's world number one, Andy Murray.
In addition to mental burnout, there are concerns about the increased physical demands.
Players are more prone to upper-body injuries in specific periods, according to PTPA research.
The organization says these "predictable clusters" are down to the tour schedule layout and the turnarounds between court surfaces.
When a high-profile game at the Australian Open ended in the middle of the night in 2023, it promised to spark change.
In 2024, the tours implemented a new rule prohibiting matches beginning past 11pm.
But there have still been instances of matches ending deep into the night - which medical experts argue must not be glorified.
"After a match concludes, an athlete's day isn't over," said Dr. Sikka.
"Media interviews, rehabilitation, and treatment are required. Your day extends well beyond the match.
"There is insufficient opportunity for the body and mind to heal. There is no other sport which mandates that."
Studies show a player is 25% more likely to be injured during a night-session match.
A lack of standardization in tournament equipment - leading to changes in feel and performance - has been identified as a source of increased upper body injuries.
"My career has been plagued by injuries to the arm and wrist," commented one top British player, "and such ailments are increasingly prevalent among peers."
A former US Open champion, who ended his career last year with an persistent wrist issue, argues tournaments in the same swing should use one standard ball.
"Implementing this would not be overly complex - the same ball for clay, the same for hard and the same for grass. That would be really helpful to the players," he said.
The tours began using a more unified ball-approval process during 2025 and project "total consistency" in the coming years.
Sports scientists believe tennis must learn from how American team sports use data to inform the health of its stars.
Using data-led analysis, the NFL mandated consistent playing surfaces and improved helmet technology to minimize the risk of injury.
"The league has altered its regulations using concrete research," said an analytics expert whose firm provides data to monitor player welfare.
"Their commercial success has soared because their games are so competitive and they're maintaining a healthy roster.
"They are investing heavily in their stated goals by protecting athletes and investing hugely – that model is the exemplar."
Other leagues have implemented policies aimed at protecting specific positions, limiting their exertion at the professional level and putting limits for young players.
Some retired players believe the stress put on the upper body of tennis players from a very early stage is a key element in their injuries later on.
"We start playing from such an early age and have so many iterations of our groundstrokes," said the former champion.
"Eventually, the wrist bears the brunt. Way more players have problems with the wrist. I think the problem is the many, many repetitions."
An increasing number of players are becoming vocal about the demands placed on them.
Current world number ones are among a collection of elite athletes increasing demands on the Grand Slams with calls for a increased portion of tournament income, as well as meaningful consultation about the calendar extent, elongated tournaments and match timing.
Last year, a top-ten American player said it was "absurd" he was only able to take one week off before the new season.
Sympathy can be in short supply, though, given top players sometimes commit to lucrative non-tour contests.
One Grand Slam champion from Britain says the daily routine is a "challenge" but thinks top players "moaning about the calendar" is not a good look.
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Elena is a tech enthusiast and business strategist with over a decade of experience in digital transformation and startup consulting.