Improvements to Ferrari's car paid off as Fernando Alonso completed the fastest lap on the first day of practice ahead of Sunday's European Grand Prix.
The Spanish driver posted a lap of 1 minute, 39.283 seconds in the second session Friday at the 5.5-kilometer (3.4-mile) Valencia street circuit, as Ferrari's vaunted aerodynamic improvements took effect.
The Red Bull duo of Sebastian Vettel and Mark Webber were second and third fastest, respectively. Vettel was 0.056 seconds behind in the second session and Webber 0.144 seconds behind. McLaren's Lewis Hamilton was fifth-fasted, with teammate Jenson Button ninth.
Earlier, Nico Rosberg of Mercedes set the pace in the first session with a lap of 1:41.175.