Yes, random allocation.
See the following section Z. ENTRY PROCEDURES / 2. Singles Main Draw / g. Method of Draw
ofin the official rulebookITF Grand Slam rulebook. Please note (note that Wild Cards may be seeded.):
Z. ENTRY PROCEDURES / 2. Singles Main Draw / g. Method of Draw
g. Method of Draw A draw sheet for 128 places will be used. The placement of seeds as heretofore provided. The remaining players, including the Qualifiers, will be drawn and placed into the vacant spaces in the draw, beginning at the top of the draw.