Sebastien Buemi set the pace on the final day of testing as Toro Rosso continued to dominate at the Spanish circuit.

The young Swiss, widely expected to be handed a drive with the Red Bull-owned team for 2009, set the fastest times on the opening two days of the three-day test and was again at the top of the order, posting a best lap of one minute 17.258 seconds to edge fellow Toro Rosso hopeful Takuma Sato into second place.

Buemi and Sato are vying with Sebastian Bourdais to get the nod at Toro Rosso for next season with both seats still up for grabs at the Faenza-based squad.

McLaren's Heikki Kovalainen claimed third place ahead of the Ferrari duo of Kimi Raikkonen world championship runner-up Felipe Massa.

Renault's Fernando Alonso was sixth quickest with Nico Rosberg seventh for Williams and the second McLaren of Pedro de la Rosa - running with the new KERS system - in eighth.

BMW Sauber duo Robert Kubica and Christian Klien rounded out the top 10.