Sebastian Vettel set top fastest lap-time in second free practice for Belgium Grand Prix. But the defending world champion endured a right-rear puncture 20 minutes from the chequered flag.
Also the Red Bull duo 1-2 with Webber second quickest, 0.059s down, even as Romain Grosjean is third fastest for Lotus.
Ferrari’s Felipe Massa handled a 1:50.164 to set fourth fastest ahead of Toro Rosso’s Jean-Eric Vergne.
The Spa supreme Kimi Raikkonen set sixth fastest ahead of morning session pace-setter Fernando Alonso. McLaren’s Sergio Perez, Mercedes GP’s Nico Rosberg and Force India’s Paul di Resta completed the top ten in the time-sheet.
Hungarian Grand Prix winner Lewis Hamilton struggled entire the session with handling of his Mercedes. The Brit set twelfth fastest behind the Force India’s Adrian Sutil.
Nico Hulkenberg, Pastor Maldonado, Jenson Button and Daniel Ricciardo completed the top sixteenth in the second practice session time-sheet.