Button made it a rare clean sweep in practice ahead of the Japanese Grand Prix as McLaren again enjoyed a one-two.
Although Button topped the timesheet at the end of Friday's two 90-minute sessions at the Suzuka circuit, the Briton was naturally unsure as to his position as Friday times are never an indicator as to true pace.
But the 31-year-old in his McLaren would genuinely appear to be the man to beat in qualifying later today after comfortably finishing out in front in the final hour-long practice run.
Button finished with a lap of one minute 31.255secs for the 5.807km track, the fastest so far of the weekend, half a second clear of team-mate Lewis Hamilton.
You have to go back to Button's championship-winning year of 2009 and the Monaco Grand Prix, 45 races ago, for the last time he was on pole.
Champion-elect Sebastian Vettel, who requires a single point to be crowned for a second successive year, was third quickest for the third time to leave Red Bull's run of 15 consecutive poles under threat.
Fernando Alonso in his Ferrari was the best of the rest, however a second down, with team-mate Felipe Massa sixth, the duo sandwiching Red Bull's Mark Webber in fifth.
A look at the Marina Bay Street Circuit.
Esteemed Formula 1 commentator Steve Slater previews the action.
ESPNSTAR presenter Steve Dawson believes history awaits the Singapore GP.
Jenson Button made it a rare clean sweep in practice ahead of the Japanese Grand Prix as McLaren again enjoyed a one-two.
Jenson Button hopes to take at least some of the shine off Sebastian Vettel's anticipated world title success by claiming a maiden Japanese Grand Prix win.
Sebastian Vettel feels his first practice accident at Suzuka served as a wake-up call to avoid thinking of his impending world title triumph.
Red Bull team principal Christian Horner has urged Mark Webber to make it a "perfect year" for the team by finishing runner-up to Sebastian Vettel.
Formula One supremo Bernie Ecclestone has spent around £1million to ensure victims of the tsunami get to see Sunday's Grand Prix.
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