Ferrari look to build on their opening pace in Friday afternoon practice for the Spanish Grand Prix in Barcelona.

HRT have a problem with Dani Clos's car following that loss of revs in the morning session.

Alonso is back in the garage.

Button has a complaint: "Unbelievable understeer, unbelievable understeer." He stands ninth and has come in.

Most drivers are in the pits now - Felipe Massa puts his Ferrari fourth ahead of Hamilton. And Alonso goes top with 1:24.739.

Alonso goes third, pushing former team-mate Hamilton down a spot.

Alonso bumps the F2012 over a kerb. Vettel and Hamilton are back in the pits.

Hamilton betters his effort with 1:25.061 but stays third. Which team do you expect to dominate this weekend?

Michael Schumacher puts Mercedes top for a spell with Jenson Button now eighth having initially slotted in P6.

Red Bull star man Sebastian Vettel goes top with a 1:25 dead, with Lewis Hamilton of McLaren second. The times flying in - Sergio Perez third in the Sauber.

In the sister STR, Daniel Ricciardo shaves a second off that time despite traffic.

A few cars out now with Vergne the first to set a time - 1:27.146. Two and a half seconds slower than the FP1 benchmark.

The Toro Rosso of Jean-Eric Vergne is first out. Drivers practising their starts in the pitlane before there is heavier traffic.

The hour-and-a-half-long session begins. No one coming out initially.

Track temperature is up at 43 degrees Celsius while air temp is 29 degrees. Hot for this time of year. Humidity is down at 32 per cent though.