Castelló/Rufo project as the higher-ceiling pair: Castelló’s experience and net craft can stabilize Rufo’s more aggressive, streaky phases. Guinart/Virseda look the more “system” team—longer rallies, heavier cross-court pressure—so the match likely hinges on who owns the left-side exchanges and who wins the transition game in Brussels’ typically slower indoor conditions. Slight edge to Castelló/Rufo if they impose first-volley dominance and target the weaker overhead lane.