Hamilton quickest with a 1:46.435 from Rosberg (+0.377), Bottas (+0.661), Alonso (+1.554), Vettel (+2.192), Perez (+2.487), Button (+2.584), Massa (+2.690), Sainz (+2.832) & Hulkenberg (+2.866).
Grosjean, Raikkonen, Ricciardo, Guttierez, Ericsson, Verstappen, Kvyat, Palmer, Magnussen, Wehrlein, Nasr and Haryanto make the rest of the field.
Verstappen only completed 7 laps due to an oil leak while teammate Ricciardo crashed damaging the rear right of his car.
The field should get closer during the second session as the track grips and the drivers gain more confidence on the new Baku street circuit.