Top-ranked star Iga Swiatek remarked in September that she considers the season is "excessively lengthy and demanding."
At the point when Daria Kasatkina cut short her 2025 season ahead of schedule in October, the one-time elite competitor described how she had "hit a wall."
"The itinerary is excessive. My mental and emotional state is frayed, and, sadly, I'm not alone," she stated.
The Ukrainian athlete Elina Svitolina, a two-time Wimbledon semi-finalist, had earlier declared she was not in "the mental space" to persist, while sitting Grand Slam champions Iga Swiatek and Carlos Alcaraz also believe the calendar is too long.
This subject is still being argued as the world's foremost tennis players assemble once more in Australia for the beginning of the 2026 season.
A slightly longer off-season than 2025 has been received well. However, a few weeks is not seen as adequate time for proper rest before training starts for an season lasting nearly a year seen as among the most demanding in professional sport.
"Tennis places greater strain on athletes now than it ever has," said Dr. Robby Sikka, medical director at the Professional Tennis Players' Association (PTPA).
"Points and games are more extended, players are faster, they're hitting the ball harder.
"We owe it to our players to protect them and give them a more manageable sport."
So what measures are in place and what additional measures could be taken?
The 2025 season spanned 47 weeks for many male competitors, starting with the United Cup team event in late December 2024 and ending with the Davis Cup final in late November.
The women's circuit concluded two weeks earlier when the tour finals concluded in early November. The ITF moved the Billie Jean King Cup Finals forward to September to alleviate scheduling concerns.
ATP officials claim it does not take the concerns of the players "without seriousness," while the WTA Tour says player welfare will "consistently be the foremost concern."
That failed to satisfy the PTPA, which initiated a lawsuit against the men's and women's tours in March, referencing "anti-competitive practices and a blatant disregard for player welfare."
Restructuring the calendar is an clear answer but cannot be achieved easily given the intricate web of tennis governance, where the four Grand Slams, ATP, WTA, and ITF each have major stakes.
"We must consider whether we can buy back time at the end of the year for an more substantial rest period, or can we buy time during the season so there is a short hiatus," said Dr. Sikka.
Former world number one Andy Roddick, a consistent campaigner for adjustments, says the season should not go past 1 November.
The ATP Tour has cut the number of events which count towards the rankings for 2026, which it is confident will reduce "overall demands" on the players.
"One point that often gets overlooked: players choose their own schedules," commented ATP chairman Andrea Gaudenzi.
"That freedom is rare in professional sport. But with that comes accountability - recognizing the right time to play and the right time to heal."
Extending several required events across a fortnight - creating so-called 'super weeks' - has also been criticized.
"I believe competitors are more worn out mentally and physically because they're away from home for extended periods," opined Britain's former men's world number one, Andy Murray.
As well as mental burnout, there are concerns about the growing physical demands.
Players are more prone to upper-body injuries in particular times of the year, according to available data.
The organization says these "foreseeable patterns" are down to the tour schedule layout and the turnarounds between court surfaces.
When a high-profile game at the Australian Open finished in the middle of the night in 2023, it was expected to drive reform.
In 2024, the tours introduced a new rule preventing matches beginning past 11pm.
But there have continued to be instances of matches concluding long after midnight - which medical experts argue must not be glorified.
"Once the final point is played, a player's duties continue," explained Dr. Sikka.
"You have to do media, recover, work with the physiotherapist. Your day doesn't finish until much later.
"There is insufficient opportunity for the body and mind to heal. There is no other sport which mandates that."
Research indicates a player is considerably more susceptible to be injured during a evening game.
A lack of standardization in tournament equipment - leading to changes in feel and performance - has been pointed to as a source of increased upper body injuries.
"I have suffered numerous arm, shoulder, and wrist issues," said one top British player, "and such ailments are increasingly prevalent among peers."
A former US Open champion, who stepped away last year with an persistent wrist issue, believes tournaments in the same seasonal segment should use one uniform ball.
"It shouldn't be too difficult - the same ball for clay, the same for hard and the same for grass. That would be incredibly useful to the players," he said.
The tours began using a more centralized ball-selection system during 2025 and project "full alignment" in the coming years.
Athletic performance experts believe tennis must emulate how American team sports use data to direct the welfare of its stars.
Based on data-led analysis, the NFL mandated consistent playing surfaces and enhanced helmet technology to reduce the risk of injury.
"American football has implemented numerous reforms driven by data," 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 keeping players out on the field.
"Their financial commitment matches their rhetoric by protecting athletes and allocating major funds – that model is the gold standard."
Other leagues have enacted regulations aimed at protecting specific positions, limiting their throws at the professional level and putting limits for young players.
Some retired players believe the load put on the upper body of tennis players from a very early stage is a significant factor in their injuries later on.
"We pick up a racket as kids and have so many repetitions 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 rising contingent of players are finding their voice about the demands placed on them.
Current world number ones are among a coalition of top players increasing demands on the Grand Slams with calls for a increased portion of tournament income, as well as substantive discussions about the tour schedule duration, extended events and scheduling.
Last year, a top-ten American player said it was "unreasonable" he was only able to take one week off before the upcoming tour.
Sympathy can be in short supply, though, given top players occasionally sign up for lucrative non-tour contests.
One Grand Slam champion from Britain says the relentless travel is a "difficulty" but thinks top players "criticizing the calendar" is not a good look.
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