If no players use protected ranking (probably Kleybanova will use it); the last entrant to MD should be Vania King (109). Garbine muguruza is the first known withdraw... If Kleybanova use her protected ranking, last IN is Hlavackova (108).
US has a mess with wild cards this year. Riske isn't in the main draw, and not sure if she will get one. Vandeweghe might need one just for qualies. So my guess Duval, Oudin, Crawford, Gibbs, Rogers, French, Aussie, and one veteran for MD.