Fastest on the final day of the Valencia test, Jack Miller remained at the head of the official Moto3 timesheets during day one of this week's Jerez outing.

Track conditions steadily improved from a mixed wet-dry surface in the morning, allowing new Red Bull KTM rider Miller to set a best lap of 1m 46.975s in the third and final Moto3 track session.

That time was only a fraction slower than the official race lap record and placed the young Australian 0.302s clear of next best Isaac Vinales (Calvo KTM), who had been fifth fastest at Valencia.

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"We can definitely improve a lot more," declared Miller. "We have many little points that we can make better, but overall it was a very, very good day today. I'm really happy with how the bike is working and with how we set up the bike today.

"For tomorrow I just need to be a little bit more consistent; I'm putting in some good laps, but it's still not perfect and we can still improve a lot. We are going to have a lot more stuff to test tomorrow, but consistency is my main goal and I won't be going out too aggressively.

"Sometimes I was a little overaggressive today and made mistakes as a result. I want to get my lap times down, and we need to keep positive and keep working in the same way as at Valencia. We've been doing a really good job so far."

Danny Kent again put his newly branded Husqvarna in the top three, with overall Valencia pace setter Niccolo Antonelli (Go&Fun) and fellow Italian Romano Fenati (VR46) completing an all KTM/Husqvarna top five.

With Alex Rins absent following recent wrist surgery, the leading Honda was Saxoprint-RTG's Efren Vazquez in sixth place, 0.870s from Miller.

Czech riders Jakub Kornfeil and Karel Hanika claimed seventh and eighth places, Miller's rookie team-mate Hanika making a much stronger start compared to 23rd overall - following a wrist injury - at Valencia.

"I'm happy with how today went," said the Red Bull Rookies Cup champion. "I think that my wrist is not really a big problem now, and it was just in the last hour that it was a little bit tired. In any case, it is in much better shape than in Valencia. In a few days it'll be 100% ready."

Frenchman Fabio Quartararo, standing in for Rins at Estrella Galicia 0.0, was an impressive eleventh fastest. The CEV Moto3 champion lapped just 0.046s slower than team regular and grand prix winner Alex Marquez.

Testing, again held alongside the Moto2 class, continues on Wednesday.