Dario Franchitti was quickest in a rain-interrupted IndyCar Series practice session at Kentucky Speedway.
After 20 minutes of clear running initially, moisture and debris at Turn 1 forced the first yellow, before a long rain shower led to a pause of nearly half an hour. IndyCar officials hoped to fit in at least 15 more minutes of running when the track finally went green again, but had to concede defeat after more rain eight minutes later.
During that final brief spell of track action, Ganassi driver Franchitti put in a 24.4955sec lap to usurp Penske's Helio Castroneves, who had led the way up to then. Scott Dixon was third in Ganassi's second car, with Dan Wheldon showing strong form for Panther in fourth, a week after his near-victory at Chicagoland.
Penske's Ryan Briscoe and Andretti Autosport's Tony Kanaan completed the top six, while championship leader Will Power (Penske) was back in 10th.
Seventh place was a promising result for Mario Moraes and KV Racing, but the leading underdog of the session was A.J. Foyt Racing's Vitor Meira, who took eighth.
The rain interruptions hampered preparations for the drivers re-acclimatizing to different teams this weekend. Paul Tracy and Graham Rahal were only 25th and 26th on their returns to Dreyer & Reinbold and Sarah Fisher Racing, respectively.
Qualifying for Saturday night's race is due to take place this afternoon, weather permitting.