Felipe Massa believes Williams will be able to give Mercedes a good run for their money at Spa and Monza.
The Grove squad have enjoyed an excellent first half of the season, picking up 135 points with three podiums to lie fourth in the Constructors' Championship.
The team, though, didn't have the best of outings - by their lofty standards this season - at Hungary last time out as the track didn't really suit the team and Massa finished fifth and his team-mate Valtteri Bottas down in eighth.
Teams are now on a three-week break, but once the season resumes Massa is confident they are in for an excellent second half to the 2014 campaign.
"I'm sure we can have a very good second half of...
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