Barcelona: Nico Rosberg of Mercedes was the fastest on the last day of Formula One's final test on Saturday under heavy rain at the Catalunya Circuit.
With poor weather conditions limiting action for most of the day, Rosberg came on late to set the best time of 1 minute, 43.814 seconds.
"It was tricky out there today. There wasn't a lot of grip, but it was really useful to get the experience on the Pirelli wet tires," Rosberg said. "We have made a lot of progress over the four tests this winter and it's really nice to see that things are going in the right direction."