Lee Holdsworth has topped the first co-driver practice session at the Repco Bathurst 1000.
The 60-minute session was declared early following an accident at Forrest's Elbow for Chris Pither.
With Pither finding the wall with two minutes remaining, Holdsworth's time remained firm atop the time sheets.
Holdsworth's session-topping 2:05.225s proved 0.833s quicker than James Moffat's time set in the corresponding 2020 session.
It was Moffat who would prove Holdsworth's closest rival, albeit 0.377s behind the #25 Mobil 1 Appliances Online Commodore.
Moffat is sharing the #6 Monster Energy Tickford Mustang with Cameron Waters, who topped the morning session.
Light rain blanketed Mount Panorama when pit lane opened, but the track remained dry for the entirety of the session.
2020 winner Garth Tander set the early running on a 2:07.346s, but the pace quickened as the session wore on.
Through 10 minutes, Holdsworth sat pretty at the top on a 2:06.786s, before Tander went quicker again on a 2:06.782s.
Holdsworth began to turn the screws, dropping in consecutive fast laps; first, a 2:06.771s, followed by a 2:06.401s.
Warren Luff slotted in behind his Walkinshaw Andretti United teammate on a 2:06.524s, with Jack Perkins slotting into fourth on a 2:06.829s.
Through 27 minutes, Craig Lowndes vaulted to the top on a 2:06.164s, which proved just 0.106s slower than the quickest time in the corresponding session last year.
In the final quarter of the session, Tander fired in a 2:06.236s to drop in behind Lowndes, before jumping to the top on the following lap.
The track continued to evolve; Alex Davison and Moffat both spent time at the top - the latter the first driver into the 2:05s - before Holdsworth went even faster.
Pither's accident ensured Holdsworth couldn't be unseated, but considering the speed in the #25 entry, it would have been a tough task regardless.
"These guys had a fast car at the start of the year here," Holdsworth said.
"Chazzy dialled it in this morning for me to jump in and have a little bit of fun around the mountain.
"Everything that's working for me is working for him.
"It's a great combination, and I'm really looking forward to Sunday.
Supercars will return to the track on Friday for Practice 3 at 10:40am AEDT. Click here to view the track schedule.
Every session of the event will be broadcast live on Foxtel (Fox Sports 503) and streamed on Kayo.
The Seven Network will provide live free to air coverage of the event. Tickets for the event are on sale now.