https://www.statista.com/statistics/606439/tennis-atp-and-wt...
2007 was also the first year that Wimbledon (the last holdout of the four majors) paid the same to men and women victors.
It seems psychologically hard to regress from that benchmark, even if in recent years overall revenue has once again diverged.
And in non-majors, the pay disparity has returned, reflecting the differences in revenues:
https://www.nytimes.com/2016/04/13/sports/tennis/equal-pay-g...