Stupaczuk/Yanguas arrive as the more established pair with higher baseline pace, transition speed, and point-ending capacity, especially in Buenos Aires’ typically lively indoor conditions. Maxi Sánchez/Rubini can compete by slowing tempo and forcing long left-side exchanges, but they’ll need near-perfect bandeja management to avoid being rushed. Prediction: Stupaczuk/Yanguas favored in 2 sets, with risk if they leak errors under crowd momentum swings.