Brawn GP's drivers Jenson Button and Rubens Barrichello occupy the first two places in the world championship heading into the MonacoGP with Button winning four of the five rounds.
The Brazilian was just shy of the time which put him on pole for the 2008 MonacoGP in the second session - with Rosberg, Hamilton, Barrichello and Button all going under it.
After the last GP in Monaco Hamilton had predicted that the McLaren cars would struggle through Istanbul Park's high-speed corners but then was encouraged by their performance in Friday practice in Turkey.