Diestro/Lancha should enter as the more stable, top-level pairing in a FIP Gold context, with clearer patterns on the left-side build and higher consistency under pressure. The Ribeiro/Ribeiro duo can compete if they win the net early and keep rallies short, but over a full match the Spanish pair’s tempo control and defensive-to-offensive transitions are likely decisive. Prediction: Diestro/Lancha in 2 sets, with tiebreak risk if conditions are slow/windy.