Vickers, who turned heads with eighth in the dry on Monday, now goes fastest on only his 3rd lap.
Yari Montella and Ryan Vickers are building wet weather WorldSBK experience and have moved into third and fourth respectively, behind Alvaro Bautista and Garrett Gerloff (who remain in the pits).
Bautista, 5th in the dry this morning, pits after 6 laps.
His best time is a 1m 44.503s (17-seconds off the best dry lap by Ducati team-mate Nicolo Bulega this week) but putting him 1.6s ahead of new closest rival Garrett Gerloff in the final session, with Gardner now third.
1hr 20mins to go.
Gardner pits and Bautista takes over at the top by 1.796s on his 4th lap.
Garrett Gerloff 3rd, Dominique Aegerter 4th and Tetsuta Nagashima remain the only other riders to have set a time.
Alvaro Bautista is the first of the big hitters on track and soon into second, but Gardner keeps improving to remain several seconds ahead.
Gardner continues to build speed and has the best lap time down to a 1m 50s.
Home star Gardner, usually comfortable in the wet, sets a 1m 55s to pull 2.9s clear of Nagashima.
Yamaha riders Remy Gardner and Dominique Aegerter also venture out.
Nagashima is running 30-seconds off dry pace but with rain also forecast for Sunday, it could well be a valuable experience.
Honda's Tetsuta Nagashima breaks the silence and heads out.
The green lights are on and the final two hours of 2025 WorldSBK pre-season testing are officially underway, but for now the conditions mean all riders remain in the pits.
Despite weather forecasts predicting rain wouldn't arrive at Phillip Island until Wednesday, spots began falling during the opening WorldSSP session.
The final 2025 WorldSBK pre-season track action will take place from 13:40-15:40 this afternoon.
Garrett Gerloff's Kawasaki being recovered after his earlier Turn 8 fall, 'rider OK'.
Ryan Vickers (Turn 4) and Tarran Mackenzie (Turn 6) also fell this morning.


The chequered flag is out with Nicolo Bulega keeping his place at the top of the timesheets and BMW's Toprak Razgatlioglu (4th) the only non-Ducati rider in the top five.
Nicolo Bulega beats his best Monday lap time with a 1m 28.680s to pull 0.482s clear of Iannone.
5mins remaining in the morning session and the order at the top is: Bulega, Iannone, Petrucci, Razgatlioglu, Bautista, Locatelli.
Nicolo Bulega (1st) and Toprak Razgatlioglu (4th) are among the minority of riders not to have beaten their best day 1 lap time so far this morning:
Approaching the final 15mins of the morning WorldSBK session and Andrea Locatelli improves to 6th for Yamaha. Remy Gardner is the next best R1 in 14th.
A brief red flag period after a Turn 8 fall for Garrett Gerloff. The Kawasaki rider is reported as 'OK'.
Michael van der Mark has done the most laps so far today at 29, closely followed by Alvaro Bautista, Alex Lowes and Dominique Aegerter on 28.
Toprak Razgatlioglu and his BMW team are among those to have been practising their wheel changes for the mandatory pit stop in this weekend's Australian races.
Classification with 50mins to go in the morning session:
1. Nicolo Bulega (Ducati) 1m 28.902s
2. Danilo Petrucci
3. Andrea Iannone
4. Toprak Razgatlioglu (top BMW)
5. Alvaro Bautista
6. Scott Redding
7. Axel Bassani
8. Alex Lowes (top Bimota)
9. Michael van der Mark
10. Xavi Vierge (top Honda)
11. Andrea Locatelli (top Yamaha)
12. Yari Montella
13. Remy Gardner
14. Sam Lowes
15. Ryan Vickers
16. Garrett Gerloff (top Kawasaki)
17. Iker Lecuona
18. Tito Rabat
19. Tetsuta Nagashima
20. Bahattin Sofuoglu
21. Dominique Aegerter
22. Tarran Mackenzie
The Italian's next lap is even better, he's into the 1m 28s and just a few tenths off his fastest time from day one.
Bulega hits the top of the timesheets for the first time today courtesy of a 1m 29.181s, on his 17th lap.
Make that an all-Ducati top four: Former champion Alvaro Bautista is now directly behind Petrucci, Iannone and Bulega.