Valtteri Bottas says there is more to come from him and his Williams after he finished second practice for the Spanish Grand Prix in eighth place.

Bottas, who sat out the morning session with test driver Susie Wolff using his FW37, did 39 laps in the afternoon, the most of anyone runner, as he looked to maximise his time on track.

In the end his best effort was a 1m 28.525s, which left him 0.031s off Jenson Button's McLaren in P7 and a tenth up on the Toro Rosso of Carlos Sainz in P9.

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"You need to have nice and clean sessions and I am happy we had a good P2, plenty of laps, which was the target and good data from the tyres," Bottas said. "[I am] still getting into it, I think there is a bit more from the car and from me for tomorrow."

"We had quite a long stint on the mediums and it felt pretty consistent," he continued. "I think the pace is still not there, but at least it was not too inconsistent."

Put to him that the pace of the Williams seems similar to the Toro Rosso, Bottas added: "Maybe in this session, but this is only Friday practice and teams are running different fuel loads in the long runs and different engine modes.

"We know what we have in the back pocket and I think it should be enough for Toro Rosso and hopefully Red Bull as well."

Meanwhile, Bottas conceded he was not very impressed with the performance on the hard tyres: "Not that great with the hards to be honest.

"The whole day really just struggled with poor overall grip in the car and the deg in the hards seems to be the same as in the medium, they are just slow."