The Aston Martins continued their recent run of a slump in form with ninth and 10th places, Fernando Alonso just 0.038secs behind Russell and a second ahead of team-mate Lance Stroll.
Daniel Ricciardo looked to have made it into the second part of qualifying in his first wet competitive session since returning to F1 with Alpha Tauri at the last race in Hungary, but his lap was deleted for exceeding track limits and he will start 19th.
British-born Thai Alex Albon was 16th in the Williams, who had expected the circuit would suit their car but likely suffered for the damp conditions favouring downforce, over the efficiency needed at Spa in the dry.
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