Valtteri Bottas has described his season as "average" so far and believes that his best performances are still to come.
After making the switch from Williams to Mercedes, Bottas has become an outsider for the World Championship title but has made a valuable contribution toward the Silver Arrows' 39-point lead in the race for the constructors' title.
However, Bottas was hoping the gap to World Championship leader Sebastian Vettel would be closer than 33 points.
"I was hoping to be slightly better positioned in the championship, and also as a team I think," Bottas said via Autosport.
"We are still looking good in the constructors', but we have had some difficult races for us, which is not ideal.
"For us as a team, only winning is good enough, that's always got to be the target. I think we definitely have work to do. I have work to do."
Bottas also said there is plenty of room for improvement and is looking forward to reaching the high standards that he sets for himself.
He added: "There are still things I can improve, as long as I keep working with the team as we've been doing at this point of the year.
"I know the second half will be better for me, and my best performances are still on the way.
"I would say the first half has been average, because I always set targets very high, but obviously [there have been] some good moments as well."