Reigning world champion Sebastian Vettel was the fastest on the track for the second straight day of Formula One's penultimate testing session before the start of the new season.
The Red Bull driver clocked a best time of 1 minute, 23.315 seconds on Saturday at Catalunya Circuit, bettering his own leading mark from the first day by 1.059 seconds.
Jaime Alguersuari of Toro Rosso had the second best time of 1 minute, 23.519 seconds, with fellow Spaniard Fernando Alonso of Ferrari coming in third at 1 minute, 23.978 seconds.
Tonio Liuzzi had the 12th fastest time driving for HRT as the former Force India driver looks to clinch the Spanish team's second seat.
Testing continues through Monday.