James P
G.O.A.T.
Could be wrong, but I believe this morning's official ATP and WTA rankings will be the cutoff for entry into main and qualifying draws. Meaning someone like a Kevin Anderson on a PR slid into a main draw slot without pushing the cutoff even lower. Effectively round about the top 100 have secured main draw entries, and round about the top 230 have secured qualifying draw entries, if not main draw entries.