Niccolo Antonelli was denied a clean sweep of this week's Valencia Moto3 timesheets after suffering a heavy fall on the final day.
But the Go&Fun Gresini rider remained quickest overall at the opening 2014 test, with his Wednesday time holding off the Thursday best of Red Bull KTM's Jack Miller.
"I'm disappointed about the fall: it was very windy this morning, I went on the dirt and as soon as I accelerated the bike launched me with a highside,” said Antonelli. “It was my mistake, I could definitely be more careful, but the wind certainly did not help me.
“After the fall I lost a lot of time, because at first I was not remembering anything of what happened, so they took me to the Medical Center.”
17-year-old Antonelli, who has enjoyed a major upturn in form compared with the previous FTR Honda machinery, returned from his morning highside to set the fourth fastest lap time.
“The important thing however is that now I'm fine: in the afternoon I went back to the track and although I was not in great shape I could set the second best lap time of the afternoon session, so for today it's okay.
“Now we are already focused on the next test in Jerez”.
Overall, Antonelli was just 0.008s quicker than Miller, with Red Bull Husqvarna's Danny Kent completing a top three covered by 0.272s.
The top non KTM/Husqvarna was Aspar's Juanfran Guevara, in seventh (+0.658s) for Kalex-KTM. Miguel Oliveira led the Mahindra challenge in ninth (+0.752s) while the much anticipated new Honda was tenth best (+0.777s) with Estrella Galicia 0.0's 2013 title challenger Alex Rins.
The next official Moto3 test takes place at Jerez from February 18-20.