Jordan King replaced Racing Engineering team-mate Norman Nato at the top of the timesheets on the second day of GP2 Series testing in Jerez.
The Englishman, who was third on the timesheets on the first day, produced his best lap of 1min 24.429secs during the considerably quicker morning session, putting him just over a tenth up on European F3 graduate and top rookie Antonio Giovanazzi in the PREMA car.
With every driver's best time occurring in the morning session, Nobuharu Matsushita made big gains over day one to set the third quickest time, ahead of French pair Pierre Gasly and day one pace setter Nato.
Title favourite Sergey Sirotkin followed up in the ART Grand Prix car in sixth, despite causing one of several red flags over the course of the day, with Alex Lynn, Arthur Pic, Gustav Malja – who was quickest in the far slower afternoon session – and Luca Ghiotto rounding out the top ten.
In all, teams had to contend with four red flags, for Sirotkin, Ghiotto and two incidents for Russian Time's Raffaele Marciello.