Andrea Iannone overcame some of the disappointment from his detrimental penalty during the Catalunya Grand Prix to top the timesheets on the first day of Moto2 testing around Motorland Aragon.
The Italian, who has struck an impressive patch of form since winning for the first time at Mugello, was on course for a third win of the season in Spain after battling his way to the front of the field.
However, in doing so he was judged to have overtaken under yellow flags, earning him a ride-through penalty and dropping him to an eventual 13th.
Nonetheless, Iannone was back on form as he and his rivals acquainted themselves with the circuit that will host the inaugural Aragon Grand Prix later in the year.
With the Speed Up rider setting a pace of 1min 55.364secs, Shoya Tomizawa was 0.394secs adrift, the Japanese rider holding onto second despite curtailing his involvement with a fall from the Technomag bike.
Julian Simon was third best, ahead of series leader Toni Elias, while Simone Corsi rounded out the top five on the JiR Moto2 bike.
Swiss chassis manufacturer Suter were present and had Racing Team Germany rider Arne Tode testing a range of different options for them, which they then intend to provide on Wednesday to a selection of riders which include Simón and Rolfo.
Moriwaki had Shogo Moriwaki on track, while for the teams Angel Rodriguez was riding for Maquinza-SAG and German supersport leader Damian Cudlin rode for the Tenerife 40 Pons team in place of the injured Axel Pons. Mattia Pasini was another addition to the list of attendees, and was riding out of the Italtrans STR box.