The prohibitive odds favoring "None" stem from the immense difficulty of securing victories across all four women's Grand Slams in one calendar year on the WTA Tour, a feat not accomplished since the late 1980s due to the physical demands of transitioning between hard courts, clay, and grass surfaces amid a deep and competitive field. Recent form from established players like Elena Rybakina shows strong consistency in select majors, yet sustaining that level through the full season remains rare, with factors such as injuries, scheduling fatigue, and upsets routinely disrupting even top-ranked contenders. Market pricing captures this historical pattern, where even leading WTA athletes face significant barriers from variable conditions and rival depth that could still produce an unlikely sweep under exceptional circumstances.