Lewis Hamilton believes Mercedes could be in for a closely-fought contest in Belgium as Ferrari and Red Bull look to have closed the gap.
Although Mercedes claimed the 1-2 in both Friday practices, they by no means destroyed the field.
In FP1 both Red Bull and Ferrari drivers were within a second of Nico Rosberg's P1 time while in FP2, on the soft tyres, Daniel Ricciardo was only four-tenths slower than Hamilton.
As such the Brit concedes he has his work cut out for him, not only closing the gap to Rosberg, but also in keeping the chasing pack at bay.
"Today was generally a good day – no problems with my car, great weather and a lot of fun out on track," Hamilton stated.
"It's not often it stays dry here and that makes it even more enjoyable with the way the track flows through great corners like Eau Rouge.
"It was great to be back out there. The car felt good and it felt very natural to be straight back to business which is a positive sign.
"Nico is very quick so I have some work to do tonight to see where I can find some time.
"Ferrari and Red Bull also look closer here than they have at past weekends, so it'll be a close run thing and we'll need to be up for the fight."
As for his team-mate's tyre blow-out in FP2, Hamilton insists it won't dent his confidence when he climbs back into the cockpit on Saturday.
"What happened towards the end of P2 with Nico obviously wasn't good but luckily he's unhurt and of course the team will be looking into it with Pirelli.
"I have no concerns, though. You have to have trust in the car and in the tyres to go out there and push, so it's not something you think about."