Lewis Hamilton said he was encouraged by the improvements he made between FP1 and FP2 after setting the fastest time of second practice for the Belgian Grand Prix.

Nico Rosberg was less than 0.1s quicker than Hamilton during the first session, but Hamilton responded to go 0.6s clear of his team-mate in the afternoon. While he admitted it had not been an ideal start, Hamilton said there was clear progress but is wary of changing conditions on Saturday which will make qualifying difficult.

"It's great to be back in the car and it was feeling good out there today," Hamilton said. "The morning wasn't as strong, but it definitely improved in the afternoon. As always, we still have work to do tonight, but overall today was OK.

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"It stayed dry throughout both sessions but the forecast is wet for tomorrow, so it was important to maximise track time as this may be our last dry running before the race. We've seen rain so often here in the past and that can really mix things up - particularly when it's wet in places and dry in others. Your visor is almost level with the ground, so it's not like looking from above where you can see the different patches. That makes it really hard to pick out the areas where you can find grip, but it's also a lot of fun."

And while Valtteri Bottas is confident Williams can put pressure on Mercedes, Hamilton said he doesn't see any one team standing out as the main challenger at this stage.

"To be honest I haven't really been looking at anyone else so I don't know who is where. I think early on I saw the Ferraris looked relatively quick. The Red Bull's looked quite good on the long runs ... I don't know, I'm sure Red Bull will be quick as well."