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Carlos Sainz led Charles Leclerc to a Ferrari one-two in Friday practice at the Singapore Grand Prix with Max Verstappen down in eighth place.
Sainz was just 0.018 seconds up on his team-mate, who was on course to go top but lost time in the final sector.
Mercedes driver George Russell was third, 0.235secs off the pace, ahead of Aston Martin's Fernando Alonso.
Verstappen and team-mate Sergio Perez, who was seventh fastest, were both complaining of a lack of rear grip.
They were behind Lewis Hamilton's Mercedes and Lando Norris' McLaren, which has a major aerodynamic upgrade this weekend.
Even on the race-simulation runs later in the session, the Red Bulls did not come into their own.
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