Ganassi's Scott Dixon led the way in Friday practice for the IndyCar Series' Lexington round - despite not venturing out until the final stages of the session.
The reigning champion only took to the track with 15 minutes remaining, but quickly made his way to the top of the timesheets, ending the afternoon 0.4 seconds clear of the field.
Justin Wilson (Dale Coyne Racing) was a frontrunner throughout the session and ended up narrowly denying Ganassi a one-two as he pipped Dario Franchitti for second place.
Tony Kanaan fell to fourth for Andretti Green Racing having been quickest for much of the early running, with Graham Rahal completing the top five in his Newman/Haas/Lanigan car.
After his last-minute call-up by KV Racing following the death of regular driver Mario Moraes' father, returnee Paul Tracy took a strong sixth place ahead of championship leader Ryan Briscoe (Penske).
Of the other drivers changing seats or reapparing this weekend, Oriol Servia was 11th on his return with Newman/Haas/Lanigan, four places ahead of Robert Doornbos, whose switch from N/H/L to HVM gave Servia a chance to get back into the series.
Pos Driver Team Time Gap
1. Scott Dixon Ganassi 1m08.2298s
2. Justin Wilson Coyne 1m08.6425s + 0.4127s
3. Dario Franchitti Ganassi 1m08.6760s + 0.4462s
4. Tony Kanaan Andretti Green 1m08.8390s + 0.6092s
5. Graham Rahal Newman/Haas/Lanigan 1m08.9932s + 0.7634s
6. Paul Tracy KV 1m09.1094s + 0.8796s
7. Ryan Briscoe Penske 1m09.1440s + 0.9142s
8. Marco Andretti Andretti Green 1m09.2477s + 1.0179s
9. Raphael Matos Luczo Dragon 1m09.2833s + 1.0535s
10. EJ Viso HVM 1m09.3563s + 1.1265s
11. Oriol Servia Newman/Haas/Lanigan 1m09.4613s + 1.2315s
12. Helio Castroneves Penske 1m09.4989s + 1.2691s
13. Ryan Hunter-Reay Foyt 1m09.4996s + 1.2698s
14. Danica Patrick Andretti Green 1m09.5421s + 1.3123s
15. Robert Doornbos HVM 1m10.0482s + 1.8184s
16. Hideki Mutoh Andretti Green 1m10.1531s + 1.9233s
17. Ed Carpenter Vision 1m10.3882s + 2.1584s
18. Dan Wheldon Panther 1m10.7354s + 2.5056s
19. Mike Conway Dreyer & Reinbold 1m11.8048s + 3.5750s
20. Richard Antinucci 3G 1m12.5210s + 4.2912s
21. Milka Duno Dreyer & Reinbold 1m15.8764s + 7.6466s