Sainz is now out there pushing on the softs. Verstappen joins the action, also on the soft.
Stroll goes second on the mediums, 0.9s off Verstappen's top time.
Bottas goes sixth on the mediums, 1.6s down on Verstappen's time from earlier.
Order with 30 minutes to go: Verstappen, Alonso, Perez, Sainz, Russell, Ocon, Hamilton, Stroll, Leclerc and Gasly.
Leclerc is back out on track after that small brake issue earlier in the session.
The Monegasque driver is forced to watch on from the garage for now.... #SingaporeGP#F1pic.twitter.com/ytckRn1oo9
— Formula 1 (@F1) September 30, 2022
Alonso slots into second, 1.1s off Verstappen.
Verstappen now moves 1.6s clear of Perez at the top of the timesheets.
George gets up close and personal with one of the barriers! pic.twitter.com/EJgWZj1AYu
— Sky Sports F1 (@SkySportsF1) September 30, 2022
Alonso moves into second, 1.3s off Verstappen's top time - both on the mediums.
Verstappen moves 1.8s clear of the rest of the field - wow!
Current order after 15 minutes: Verstappen, Perez, Sainz, Alonso, Ocon, Norris, Stroll, Hamilton, Bottas and Albon.
Replays show Russell hitting the barrier square-on at Turn 11. Some minor front wing damage there.
Verstappen improves to a 1m45.466s, 1.1s ahead of Perez. Alonso is now 1.8s off.
Big improvements from the reigning F1 champion.
Leclerc is back in the pit lane after reporting a brake issue with his Ferrari.
Two-time Singapore GP winner, Alonso, now takes to the top with a 1m47.291s, less than a tenth ahead of Verstappen - both drivers are on the mediums.
Max goes fastest round Marina Bay
— Formula 1 (@F1) September 30, 2022
It's a time of 1:47.239 for the birthday boy #SingaporeGP#F1pic.twitter.com/Cr3nC85edf
Verstappen goes 2.3s clear of the rest of the field with a 1m47.329s.
Red Bull teammate Perez now slots into second, 0.9s off.
Sainz now takes to the top with a 1m50.961s, a tenth ahead of Magnussen.
Magnussen takes to the top with a 1m51.074s, a tenth ahead of Bottas.
Zhou is 0.6s off in third - recently re-signed for 2023 with Alfa Romeo.
CARS ON TRACK CARS ON TRACK #SingaporeGP#F1pic.twitter.com/M7UCDVVhL8
— Formula 1 (@F1) September 30, 2022
16 of the 20 cars are now out on track. Just Vettel, Stroll, Albon and Russell in the pit lane.
FP1 is now underway in Singapore - Bottas and Zhou take to the circuit for Alfa Romeo.