World number one Aryna Sabalenka has asked the Grand Slams to "come to the table" as the leading stars ramp up the pressure over their calls for increased prize money and greater player welfare.
Sabalenka is among the top 20 men's and women's players who have asked the four majors - Wimbledon, the Australian Open, the French Open and the US Open - for the whole field to receive a larger share of the revenue generated by tournaments.
The group of players also want a promise that meaningful change to the structure of the tournaments and support provided by the Slams - to protect their physical and mental health - will be implemented.