Seven-time Supercars champion Jamie Whincup has responded from a poor morning session to take out second practice at Phillip Island.
The Red Bull ace finished 17th in Friday's first practice when fellow Holden driver James Courtney came out in front, as early fog blanketed the regional Victorian venue.
Drivers had to wait 30 minutes for practice two after the session was delayed because of a crash in a support category.
Once they were out on the track, Whincup set a hot early pace with a best lap of 1:29.9856s and never looked like relinquishing his advantage.