Mark Webber was fastest in the first practice session for the 2010 Singapore GP (1:54.589) . The drivers were rather cautious in FP1 on the slowly drying damp surface. This tweet from @MauriceHamilton shows how cautious (or slow) the cars were in these conditions:
With few minutes of FP1 remaining on still-damp track; best time 1:56.2 is 10 seconds off Q2 time last year.
Michael Schumacher was second, Adrian Sutil third. Behind them Vettel, Alguersuari, Button, Liuzzi, Buemi, Kubica, Petrov, Alonso, Kobayashi, Heidfeld, Rosberg, Kovalainen, Barrichello, Hulkenberg, Hamilton, Massa, Glock, d’Ambrosio, Senna, Klien and Fauzy.
Although the cars were sliding all over the place nobody ended up in the barriers on the tricky surface.
Sebastian Vettel and Mark Webber dominated the second free practice in Singapore and finished the session on top ahead of Jenson Button, Fernando Alonso and Lewis Hamilton. Barrichello finished in 6th place followed by Massa, Rosberg, Kubica, Schumacher, Hulkenberg, Kobayashi, Heidfeld, Petrov, Liuzzi, Sutil, Alguersuari, Buemi, Kovalainen, Glock, di Grassi, Trulli, Senna and Klien.