Barcelona: Mercedes' Nico Rosberg was the fastest driver during Formula One preseason testing Tuesday, while Fernando Alonso took a long first spin with Ferrari's new car for 2013.
Defending champion Sebastian Vettel of Red Bull had the best time until late into the afternoon session when Rosberg unleashed a flying lap of 1 minute, 22.616 seconds. Vettel's one-lap time ended up being the fourth fastest of the day.
"We had a mixed day today with some laps lost this morning. However, we were able to work through a good program this afternoon and, of course, it's always nice to be quickest at the end of the day," said Rosberg, who is teaming up with newcomer Lewis Hamilton this season.