Red Bull topped the times in opening practice for the Spanish Grand Prix in Barcelona, with Mark Webber emerging quickest ahead of defending champion Sebastian Vettel.
After the Sauber of Sergio Perez topped the times early on, Webber moved to the head of the pile and then improved his lap down to 1min 25.142secs – which would remain unbeaten for the remainder of the session.
Such was Webbers pace during the session, he was the only man below the 1min 26secs mark with Vettel just over a second behind the Australian with the second fastest time.
Nico Rosberg was third fastest for Mercedes as he seeks to build on his recent points scoring results while Fernando Alonso was fourth for Ferrari in front of his home fans. After his earlier heroics, Perez was fifth for Sauber with Lewis Hamilton leading McLaren's challenge in sixth.
Michael Schumacher, Nick Heidfeld, Jenson Button and Michael Schumacher completed the top ten.
Further down the order, Pastor Maldonado endured a tough start to the weekend when he managed just eleven laps before going off track at turn twelve. Although the Williams driver didn't make it as far as the barriers, Maldonado was unable to return to the track and was forced to watch on from the sidelines for the remainder of the session.
Jaime Alguersuari was another driver in the wars with an engine issue limiting him to just nine laps for Toro Rosso, with the youngster down in 18th ahead of his home race.
At the back of the field, Heikki Kovalainen was quickest of the new teams ahead of Jerome D'Ambrosio – with a massive 1.7secs between the pair.
However, Timo Glock, Tonio Liuzzi, Jarno Trulli and Narain Karthikeyan were all outside 107 per cent of Webber's benchmark time.
To see the FP1 times in full, click here