Stupaczuk/Yanguas enter as the more established pair with higher pace, transition speed, and defensive-to-offensive conversion—traits that usually decide Major-level matches. Castaño/Gil can compete if they slow the rally tempo and win the cross-court patterns, but over a full match the favorites’ pressure in the middle and on second volleys should tilt sets. Prediction: Stupaczuk/Yanguas in 2 sets, tight early then separation via break runs.