While watching the 2022 US Open 1st Round match between Raducanu and Cornet, one of the commentators said something along the lines of the following:
[...] the balls are different this year, they are slightly heavier than before, but still different to the men's balls.
Not exact wording, it's from memory, but the gist of the sentence is the same.
This surprised me as a very casual tennis fan, in that I naively assumed that a tennis ball is pretty much the same as any other tennis ball and, if there are differences, then at the elite level I would have thought that there would have been some standardisation across the professional scene, for both men and women.
What are differences between the men's and women's tennis balls (if any; perhaps I misheard the commentator, or he misspoke), and why are they different?