Ruiz/Rubio come in as the more proven FIP-pairing, typically stronger in structured patterns and pressure management, which matters in a Silver where matches swing on a few key games. Harris/Loughlan can compete if they win the speed battle and keep points short, but over extended rallies the Spanish duo should gain control through better lane discipline and transition reads. Slight edge Ruiz/Rubio in two tight sets if they protect serve early and convert first-break chances.