Carlos Sainz has described the updated Toro Rosso STR10 as a 'step forward' after giving the car its first run at the start of the the final pre-season test at the Circuit de Catalunya.

The revised chassis broke cover with several new parts on the STR10, most notably a revised nose cone which replaces the flatter design shown at its launch with another that features an appendage similar to that of the Williams.

With four days to bring the car up to speed before the opening round in Australia, Sainz was impressed with the performance of the STR10 straight out of the box and though technical issues consigned him to a lengthy stay in the pit lane in the afternoon, he was full of praise for the team's efforts in getting it to this stage.

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"It felt different and really good to be honest," he said. "I want to congratulate all the guys back in for their great job because it felt really good straight out of the box. It was a step forward and more of a complete package.

"I always say the first impression of a car on a driver is very important and on my out-lap and when I started pushing it was very good. This gave me a really positive feeling for the rest of the day and it really felt good.

"There was a lot of data gathering in the morning, 25 or 30 laps at constant speed. Finally I got a clear run at the end of the morning and it had a lot of attention on it, everyone was expecting from it because they wanted to see how the car really worked.

"After I boxed and I did my first flying lap we were all a bit surprised and said 'finally it works'. It took a big weight off of us and it is really nice to see the work in progress.

Pushed on where he feels the improvements are, Sainz feels the STR10 is giving more downforce and it is improving the handling of the car.

"It is the pure downforce, overall grip and a better car balance which overall helps the car consistently in the corners. Overall the easiest thing to feel was the improved downforce."

Sainz hands the car over to Max Verstappen for the Friday test.