Good afternoon everyone and welcome to the real start of the race weekend in Spain - it's the qualifying session for the Spanish GP in Barcelona. Follow Eurosport Yahoo!'s live coverage as the grid is decided.

Petrov looks like he'll be stronger in this second lap of his run - half a second up on his first split time already.

1:28.981 to get us started from Karthikeyan's HRT, Liuzzi just a shade quicker, and Petrov in the more competitive Renault only marginally better.

HRT's Karthikeyan out on a quick lap now - the backmarkers will be wary of the 107% rule this weekend given Red Bull's pace. If they are 107% outside the leading qualifying time they will not be able to race on Sunday.

Lotus were hoping that their upgrade package to the car would mean that they would be competing with the likes of Williams and Force India this weekend - this will be the acid test. Practice was not entirely convincing.

Q1 begins! 20 minutes of action, the seven slowest cars will be eliminated at the end of it.

Race against time for Nick Heidfeld in the Renault - his car went up in flames during the morning practice, and to have everything ready to be competitive in qualifying may be a step too far. He'll be one to watch this afternoon.

Bad news for Ferrari - the rear wing they were trialling on Friday has been inspected and ruled illegal. Alonso was not happy with the balance of the car this morning, branding the car 'undriveable' as he finished the session ninth.

Free Practice 3: Webber dominates the session, but right at the death Vettel snatches the top time with a scintillating run as Red Bull assert their superiority.

Free Practice 2: Webber top again, but Hamilton takes his McLaren close to give Red Bull's rivals hope.

Free practice 1 - Webber dominates the session where upgrades are tested out.

Sunny skies in Barcelona and track warming up - perfect conditions for racing.