Coco Gauff said that a record prize pool at the Australian Open starting on Sunday was "progress" but "still not where we'd like it".
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The leading players in men's and women's tennis joined forces last year seeking from the four majors a higher per centage of tournament revenue and contributions towards welfare programmes such as pensions.
They also want to be consulted when any of the Grand Slams consider making changes that could directly affect them.
The Australian Open pledged a 16 per cent increase in the total prize purse to Aus$111.5 million (US$75 million) this year.
The winners of the men's and women's singles at the first Grand Slam of the year will each take home Aus$4.15 million, up 19 per cent from last year.
Asked on Friday about the increase, two-time major champion Gauff said: "The per centage is still, of revenue comparison, not where we would like it.
"I think there's still further conversations that have to be had, not just with the Australian Open, but with all the slams."
She added: "The collective feeling is that, yes, there's been progress, but I still think it's not where we would like to see it."
Top players say the changes they are after would benefit the entire tennis ecosystem, and not just those at the top.
Asked if she expects more talks with the slams in 2026, Gauff said: "I think no one wants this conversation to be continuing for years and years.
"So I would imagine that we would continue to have those conversations and maybe more pressure being applied with especially the top 10."
World No 1 Aryna Sabalenka – who like Gauff has represented the players in talks with the majors – was also asked Friday if the Australian Open concessions were enough.
"I think we always can do better," the four-time Grand Slam champion replied.
"But I think all of the slams, they are trying to work together with us and come to a conclusion. I hope one day we'll get to a happy place for everyone."
Asked how they could do better, she declined to say.