Jannik Sinner is among the players to have written to the Slams on two occasions this year

Leading tennis players including Jannik Sinner and Aryna Sabalenka are understood to be unhappy with the Grand Slams about a lack of progress over welfare, prize money and consultation reforms.

The top 10 players from the men’s ATP and women’s WTA tours have been in discussions with Wimbledon, the French Open, the US Open and the Australian Open for six months in a bid to secure concessions in three key areas from the four Slams.

They have asked the Slams to increase prize money to a percentage of revenue in line with big ATP and WTA events, begin making financial contributions to player welfare benefits such as healthcare and pensions, and to consult a player council on any planned changes.

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