lewis hamilton suggested mercedes will be back in control for this weekend 's chinese grand prix .
ferrari and sebastian vettel conjured one of the biggest surprises for many a formula one season with the team 's first victory for almost two years at the last race in malaysia .
many people expected another dominant mercedes campaign in the wake of last season 's crushing success and thoroughly convincing win in the opening race in australia .
lewis hamilton was fastest in first practice for this weekend 's chinese grand prix .