Valtteri Bottas says the progress Williams has made with the new Mercedes power unit over the first two days of testing has been "amazing".

Mercedes-powered cars completed 212 laps on Wednesday, comfortably more than Ferrari (100) and Renault (38), with Bottas completing 35 laps in the Williams. Having driven the car on both of the opening two days, asked by Crash.net how much progress had been made Bottas said he had been impressed with the steps forward.

"I think we've been improving a lot, it's amazing," Bottas said. "Every run there's always been something that we've improved and especially [on Wednesday] getting a few more laps it was really nice to see the progress. We made good steps forward but I really feel we have a lot of steps to make to achieve something that we can be happy about."

While Bottas played down any issues being suffered by teams with other engine suppliers, he admitted the Mercedes team's ability to complete 97 laps on the second day was a surprise.

"Of course that was impressive and they've already got to the stage where they can put in a lot of mileage, but we need to focus on our job. That's all we can do and hopefully we can get there soon,"

Asked if getting such mileage in so early in the test could give Mercedes a big advantage, Bottas replied: "Possibly, we will see..."

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