He moves into third in the Williams, a tenth off Perez.
A strong lap from Sainz, particularly in the first sector, to go second behind Perez.
It's ninth for Hamilton, 0.9s off Perez's time. Russell is down in 13th in the other Mercedes.
They are both running on the yellow-marked mediums.
Perez sets a 1m43.436s, 0.2s ahead of Verstappen. It's a Red Bull 1-2.
A 1m44.876s for Bottas, 0.2s ahead of Gasly. The Finn is around 1.0s clear of teammate Zhou.
Softs for everyone, but interestingly, the two Mercedes drivers are on the mediums here in Q1.
This should be a fun qualifying...
- It's tight at the front with the top four teams all in the fight for pole
- Perez appears to be back on form - a Baku specialist over the years
- Russell fastest in FP3 after an impressive final sector, just ahead of Leclerc
Just under 30 minutes now until the start of qualifying.
Russell on top ahead of Leclerc, Norris, Piastri, Verstappen, Sainz, Perez, Albon, Colapinto and Hamilton.
He sets a 1m42.514s, 0.013s ahead of Leclerc.
A 1m42.737s for Norris as he slots into second overall, 0.173s down on Leclerc.
Russell moves into third for Mercedes, setting the fastest final sector.
A 1m42.564s for Leclerc, 0.2s ahead of Piastri. Perez is third overall, 0.4s off.
Piastri, Perez, Leclerc, Verstappen, Albon, Alonso, Sainz, Russell, Norris and Hamilton is the top 10.
He lowers the benchmark to a 1m42.749s, 0.6s ahead of Perez.
He sets a 1m43.389s to go fastest again. He's on it this weekend.
A tidy lap from the Ferrari driver as he sets a 1m43.455s, 0.168s ahead of Albon. Sainz slots into third, 0.3s down.
Norris sets a 1m44.266s, a tenth ahead of Albon.
FP3 is back underway with 20 minutes to go.
Red flag - he's crashed down at Turn 1.
An impressive 1m44.371s for Albon but expect times to come down considerably as the session progresses.
Verstappen goes clear now, less than a tenth ahead of Sainz. Perez slots into third.