The last few days I have been at the Australian open. Watching matches on Margaret Court Arena (3rd largest stadium at Melbourne Park around 6000 seats) I saw at time up to 25 if not more photographers. These were 1st or 2nd round matches between players ranked 20-100+ in the world. on the 2 major stadiums there is even more photographers with much more well known players competing. With tens of maybe even hundreds of thousands of photos being taken per match where do they all go?

Sure one or two will go to each large news paper, one to the Australian open website, one to the ATP/WTA websites and the others? That being said I'd imagine newspapers, Australian open and possibly ATP/WTA would have their own photographers working exclusively for them. So who are all the others?
Reading through this forum I've come to understand how hard and competitive of a profession professional photography is but until now I didn't really see it for my own eyes.

some insight would be much appreciated