Lewis Hamilton says he is 'really happy' with his performance on the first day of free practice for the Bahrain Grand Prix, even if he echoed team-mate Nico Rosberg's suggestion that Ferrari appear strong in race trim.

The Briton - who topped every session of the Chinese Grand Prix - spent the morning focusing on long runs in the hot daytime temperatures, before concentrating on set-up in the more representative ambience of FP2.

A tenth slower than team-mate Rosberg by the end of the day, and four tenths clear of Kimi Raikkonen in third, Hamilton signalled pleasure with his performance, saying he feels stronger than he did during the similarly hot temperatures of Malaysia.

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"It's generally been a pretty good two sessions, we got long runs in and understanding about the tyres so we're definitely in a better position this weekend than we were in Malaysia.

"The crucial part was we know we have speed in a qualifying lap so it's more the speed on the race runs, that's an area we're really trying to work on. The car has been feeling very good, I'm really happy with it."

Despite this, Hamilton admits the strong long run pace of Ferrari in FP2 has caught his eye, echoing the sentiments of team-mate Rosberg, who described its form as 'worrying'.

"I think they're going to be very close. They look very good, from what I can see, in the long run."