Ricky Stenhouse Jr set the pace on a rain-shortened NASCAR Sprint Cup practice day for the Daytona 500.
The Roush Fenway driver posted the fastest lap when he reached 197.027mph during the early stages of first practice.
He topped the timesheets while running in a five-car draft and his speed remained unmatched for the majority of the session, which was abandoned 20 minutes before the end due to rain showers.
Team-mate Greg Biffle was second quickest before the rain arrived - having achieved 196.954mph - followed by Danica Patrick, David Ragan and series returnee Tony Stewart.
With the weather forecast showing no further improvements for the remainder of the day, the second session was subsequently cancelled.
Twenty-nine of the 43 drivers due to start the 500-mile Cup opener participated in the first, with one notable omission being Martin Truex Jr.
He failed to run at all on Friday after he was involved in a multi-car crash in the second of Thursday's Duel qualifying races.
The Furniture Row racer has been forced to switch to a back-up car, which has cost him his front row grid spot for Sunday.
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Revised Daytona 500 grid: Pos Driver Team/Car 1. Austin Dillon Childress Chevrolet 2. Matt Kenseth Joe Gibbs Toyota 3. Denny Hamlin Joe Gibbs Toyota 4. Kasey Kahne Hendrick Chevrolet 5. Jeff Gordon Hendrick Chevrolet 6. Marcos Ambrose Petty Ford 7. Kurt Busch Stewart-Haas Chevrolet 8. Dale Earnhardt Jr Hendrick Chevrolet 9. Paul Menard Childress Chevrolet 10. Josh Wise Parsons Ford 11. Brian Scott Childress Chevrolet 12. Aric Almirola Petty Ford 13. Trevor Bayne Wood Brothers Ford 14. AJ Allmendinger JTG Daugherty Chevrolet 15. Kyle Larson Ganassi Chevrolet 16. David Gilliland Front Row Ford 17. Landon Cassill Hillman Chevrolet 18. Ryan Newman Childress Chevrolet 19. Clint Bowyer Waltrip Toyota 20. Tony Stewart Stewart-Haas Chevrolet 21. Jamie McMurray Ganassi Chevrolet 22. Cole Whitt Swan Toyota 23. Terry Labonte Go FAS Ford 24. Greg Biffle Roush Fenway Ford 25. Bobby Labonte Hscott Chevrolet 26. Danica Patrick Stewart-Haas Chevrolet 27. Casey Mears Germain Chevrolet 28. Alex Bowman BK Toyota 29. Carl Edwards Roush Fenway Ford 30. Brian Vickers Waltrip Toyota 31. Jimmie Johnson Hendrick Chevrolet 32. Brad Keselowski Penske Ford 33. Ricky Stenhouse Jr Roush Fenway Ford 34. Joey Logano Penske Ford 35. Michael Annett Baldwin Chevrolet 36. Kyle Busch Joe Gibbs Toyota 37. Kevin Harvick Childress Chevrolet 38. Reed Sorenson Baldwin Chevrolet 39. Justin Allgaier Hscott Chevrolet 40. Parker Kligerman Swan Toyota 41. Michael Waltrip Waltrip Toyota 42. David Ragan Front Row Ford 43. Martin Truex Jr Furniture Row Chevrolet*
*Demoted for using back-up car
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