Sainz collected his second consecutive F1 pole position having managed to head qualifying in Monza, and starts alongside George Russell on the front row of the grid for Sunday's race.
The rest of the top five include Sainz's Ferrari team-mate Charles Leclerc, McLaren's Lando Norris, and Mercedes' Lewis Hamilton.
Verstappen meanwhile was eliminated in Q2 during a miserable qualifying session, in which he was handed a trio of stewards' investigations for alleged impeding offences. Further blushes were spared as none of those investigations yielded a penalty, cementing his 11th-place grid position.
Despite Red Bull's pace struggles in Singapore, having encountered challenges with balance and a weak front-end, Sainz reckoned that Verstappen may still have a part to play in the victory battle.
"I don't think you can ever discount Max and Red Bull. They might turn up tomorrow with a race pace that they've had there all season, and still managed somehow to make it through the field," said Sainz after qualifying.
"But, for sure, around here, they have a much more difficult task. And it's a much better opportunity [for us] than Monza, for example.
"I think tomorrow the race is going to be between the top five cars that are starting.
"It is true that George has this extra medium tyre but we could also do a two-stop as the soft didn’t look too bad. I think it will be a tough race to manage, a tough race to put together but I think if we nail it, we have a great opportunity."
Source: Autosport