Today was the first day to buy Roland Garros tickets online.
Like every year the website was a mess.

At midnight, 1am and 2am:

Sorry the website is temporarily close for the preparation of the opening of the tickets sales for the General Public

At 8am, 10am and 11am:

After numerous tries and bugs on the website, I finally managed to buy tickets. Not the one I wanted, but better than nothing.