Castillón Gámez/Portillo Pérez should be favored in a Major setting if they control the net early and keep rally tolerance high. López Moral/Touly can threaten by accelerating with first-volley pressure and targeting the weaker transition defender, but Majors usually reward the pair with cleaner bandeja/víbora patterns and fewer unforced errors. Slight edge to Castillón/Portillo in two tight sets if they win the middle and manage lobs consistently.