Travel disruptions following airspace closures in the Gulf have forced Daniil Medvedev and Andrey Rublev to miss an Indian Wells exhibition, while an ATP Challenger in Fujairah was cancelled amid security concerns.
Novak Djokovic said he would step away completely from the Professional Tennis Players Association, citing concerns over transparency and governance within the organisation.
Carlos Alcaraz distanced himself from the class-action lawsuit filed by the Professional Tennis Players' Association
'We have exhausted all options for reform through dialogue, and the governing bodies have left us no choice but to seek accountability through the courts.'
'I've never been a fan of division in our sport, but I've always fought for better representation and influence of and positioning of the players globally in our sport, which I think is still not where I think it should be.'
The event comes at a time when tennis is facing criticism over its relentless tour schedule.
Rather than face the prospect of a lengthy ban, with a decision expected by the end of the year, World No 1 Jannik Sinner accepted the three-month suspension which will allow him to return before the French Open.
'The romanticism of late night tennis in New York, it's time to move past that'
Novak Djokovic said a majority of players believe favouritism is at play in the tennis anti-doping system.
Simona Halep questioned the "big difference" in how doping cases are treated after world number two Iga Swiatek was handed a one-month drugs ban
Djokovic's players body blindsided ATP player council, says Anderson.
It was sweet victory for Japan's Miyu Kato as she bagged the mixed doubles crown with Tim Puetz after being disqualied from the women's doubles.
The Serb set up the breakaway PTPA on the eve of the US Open in September and resigned as head of the player council but last month he confirmed that he had been nominated by his fellow professionals for the current elections which he accepted.
'Everybody knows that they could wait a little bit, no? It was an unfortunate decision.'
World number one Novak Djokovic had enough on his plate already on Wednesday without marauding Russian Daniil Medvedev pummelling him to a shock 6-3, 6-3 defeat at the ATP Finals.