How the hell would I know -
1) I'm not a woman
2) I'm not an elite athlete
So can't really take an empirically based view
It is a bit of a nonsense argument or debate because what athlete is actually ever anywhere near 100% fit, especially in a physically demanding sport such as tennis - I would hazard a guess many players (both male and female) carry injuries/strains etc given the demands of their sport, and as athletes they condition themselves to adjust.
For men to start debating about the menstrual cycle is just ludicrous.