Najrýchlejší jazdec v prvom meranom tréningu na Veľkú cenu Singapuru 2009 bol Rubens Barrichello.
Výsledky:
| 1. | Rubens Barrichello | Brawn-Mercedes | 1:50,179 | - | 19 |
| 2. | Jenson Button | Brawn-Mercedes | 1:50,356 | + 0,177 | 22 |
| 3. | Mark Webber | Red Bull-Renault | 1:50,416 | + 0,237 | 21 |
| 4. | Fernando Alonso | Renault | 1:50,567 | + 0,388 | 16 |
| 5. | Sebastian Vettel | Red Bull-Renault | 1:50,614 | + 0,435 | 16 |
| 6. | Heikki Kovalainen | McLaren-Mercedes | 1:50,699 | + 0,520 | 21 |
| 7. | Lewis Hamilton | McLaren-Mercedes | 1:50,715 | + 0,536 | 17 |
| 8. | Robert Kubica | BMW Sauber | 1:50,815 | + 0,636 | 15 |
| 9. | Kimi Räikkönen | Ferrari | 1:50,865 | + 0,686 | 19 |
| 10. | Kazuki Nakajima | Williams-Toyota | 1:51,089 | + 0,910 | 25 |
| 11. | Nico Rosberg | Williams-Toyota | 1:51,427 | + 1,248 | 23 |
| 12. | Adrian Sutil | Force India-Mercedes | 1:51,544 | + 1,365 | 14 |
| 13. | Sébastien Buemi | Toro Rosso-Ferrari | 1:51,643 | + 1,464 | 28 |
| 14. | Nick Heidfeld | BMW Sauber | 1:51,656 | + 1,477 | 15 |
| 15. | Timo Glock | Toyota | 1:52,083 | + 1,904 | 20 |
| 16. | Jarno Trulli | Toyota | 1:52,135 | + 1,956 | 20 |
| 17. | Giancarlo Fisichella | Ferrari | 1:52,390 | + 2,211 | 24 |
| 18. | Vitantonio Liuzzi | Force India-Mercedes | 1:52,905 | + 2,726 | 23 |
| 19. | Jaime Alguersuari | Toro Rosso-Ferrari | 1:53,232 | + 3,053 | 25 |
| 20. | Romain Grosjean | Renault | 1:53,458 | + 3,279 | 9 |
