Scott Dixon remained the man to beat in final practice for the IndyCar Series title decider at Homestead.
Ryan Briscoe was second again, ahead of the third championship contender Dario Franchitti.
The session was halted two minutes early after a big crash for Briscoe's Penske team-mate Helio Castroneves.
The left rear suspension of the Brazilian's Dallara-Honda appeared to suffer a failure, pitching Castroneves into a violent spin. He was able to walk away unaided.
Franchitti had been quickest in the first half hour of the split session, with his Ganassi team-mate Dixon beating Briscoe to the top spot in the second segment.
Newman/Haas/Lanigan and KV Racing continued to be the title combatants' closest challengers. Graham Rahal and Alex Lloyd were fourth and fifth overall - Lloyd having been an excellent second to Franchitti in the first part of the session - with Moraes sixth for KV.
Raphael Matos made further progress up the top ten and ended up seventh for Luczo Dragon, while his rookie title rival Robert Doornbos (HVM) was slowest of all.
Danica Patrick (Andretti Green), Ed Carpenter (Vision) and Tomas Scheckter (Dreyer & Reinbold) completed the top ten. After her strong morning performance, Sarah Fisher was back in 21st having had to make an unscheduled engine change between sessions.
Pos Driver Team Time Gap
1. Scott Dixon Ganassi 25.1097s
2. Ryan Briscoe Penske 25.1433s + 0.0336s
3. Dario Franchitti Ganassi 25.2833s + 0.1736s
4. Graham Rahal Newman/Haas/Lanigan 25.3648s + 0.2551s
5. Alex Lloyd Newman/Haas/Lanigan 25.4022s + 0.2925s
6. Mario Moraes KV 25.4338s + 0.3241s
7. Raphael Matos Luczo Dragon 25.4449s + 0.3352s
8. Danica Patrick Andretti Green 25.4452s + 0.3355s
9. Ed Carpenter Vision 25.4457s + 0.3360s
10. Tomas Scheckter Dreyer & Reinbold 25.4512s + 0.3415s
11. Tony Kanaan Andretti Green 25.4609s + 0.3512s
12. Hideki Mutoh Andretti Green 25.5089s + 0.3992s
13. Helio Castroneves Penske 25.5443s + 0.4346s
14. Milka Duno Dreyer & Reinbold 25.5813s + 0.4716s
15. Marco Andretti Andretti Green 25.5855s + 0.4758s
16. Ryan Hunter-Reay Foyt 25.6693s + 0.5596s
17. EJ Viso HVM 25.7086s + 0.5989s
18. Dan Wheldon Panther 25.7691s + 0.6594s
19. Mike Conway Dreyer & Reinbold 25.8162s + 0.7065s
20. Justin Wilson Coyne 25.8336s + 0.7239s
21. Sarah Fisher Fisher 26.0460s + 0.9363s
22. Jaques Lazier 3G 26.0576s + 0.9479s
23. Robert Doornbos HVM 26.0613s + 0.9516s