Hamilton quickest in FP2, frustration for Vettel
World champion Lewis Hamilton was 0.867 seconds faster than Nico Rosberg in the second session at the Sochi Autodrom circuit.
Lewis Hamilton turned the tables on Mercedes team-mate Nico Rosberg by setting the pace in a second practice session which brought more frustration for Sebastian Vettel at the Russian Grand Prix on Friday.
Championship leader Rosberg was three-quarters of a second quicker than Hamilton in FP1, but the world champion responded in ominous fashion at the Sochi Autodrom circuit.
Hamilton, eyeing a third successive victory in Russia and a first of the season, clocked a blistering lap of one minute 37.583 to top the timesheets ahead of Vettel.
Rosberg has won all three races so far this season and led the way with a lap of 1:38.127 in FP1, but was 0.867secs slower than Hamilton to finish third in the second session.
Vettel was second-fastest, 0.652 adrift of Briton Hamilton, but endured the frustration of spending much of the session kicking his heels after suspected electrical problems brought his Ferrari to a halt.
Four-time world champion Vettel, using a new internal combustion engine this weekend along with team-mate Kimi Raikkonen, was only able to run for half an hour of the 90-minute session.
Raikkonen was fourth in FP2, with Red Bull's Daniel Ricciardo fifth after giving the aeroscreen cockpit protection system a first outing in public on an installation lap before it was removed for the first practice session.
1. Lewis Hamilton (Mercedes) 1:37.583
2. Sebastian Vettel (Ferrari) 1:38.235
3. Nico Rosberg (Mercedes) 1:38.450
4. Kimi Raikkonen (Ferrari) 1:38.793
5. Daniel Ricciardo (Red Bull) 1:39.084
6. Valtteri Bottas (Williams) 1:39.185
7. Daniil Kvyat (Red Bull) 1:39.193
8. Jenson Button (McLaren) 1:39.196
9. Felipe Massa (Williams) 1:39.289
10. Fernando Alonso (McLaren) 1:39.400