Massa shines in rain
Ferrari's Felipe Massa topped the timesheets in testing at Barcelona's Circuit de Catalunya on Wednesday.
Rain fell for the second successive day at the Spanish circuit, limiting the number of laps teams were able - or willing - to complete.
In fact one team, McLaren-Mercedes, opted not to run at all.
"Due to the wet weather conditions, the Vodafone McLaren Mercedes test team will not be testing today in Barcelona," the team said in a statement. "Conditions will be reviewed again tomorrow morning."
Massa clocked a best of one minute 30.673 seconds to beat Red Bull's Mark Webber by 0.540s, while Ferrari's test driver Luca Badoer finished up in third place, a further 0.075s adrift.
However, it wasn't a problem-free day for Massa, who slid off the track at Turn 12 near the end of the morning session.
The Brazilian, though, managed to avoid damaging his F2008 and therefore was able to resume running.
David Coulthard set the fourth best time ahead of Renault's Fernando Alonso.
The double world champion was over a full second off the pace as he worked on bettering the R28's handling in the wet.
"Another disrupted day and we did not do many laps. It was too wet in the morning to do any running so we waited until the afternoon," Alonso said.
"We did some laps and tried some things in the wet and it was a chance to get used to driving without traction control and to improve the behaviour of the car in these conditions.
"Tomorrow the forecast is better; we have been waiting for these conditions all week, so fingers crossed."
Williams driver Nico Rosberg finished in sixth place ahead of the Toyotas of Timo Glock and Jarno Trulli.
Glock, however, had his running cut short when he crashed during the afternoon session.
"That was only half a day's work for me today because the morning was too wet for us to gain anything from testing," the German said.
"In the afternoon we did some running in the wet conditions - first on heavy wet tyres, changing to standard wet tyres.
"The track conditions changed quite a lot as the track dried out but not enough. It was difficult to draw conclusions but we found a similar picture to the dry which will help us define where we concentrate our work.
"We have a few more days of testing to work out how to move forward so we will push hard."
1 F. Massa Ferrari 1:30.673 46 laps
2 M. Webber Red Bull 1:31.213 43 laps
3 L. Badoer Ferrari 1:31.288 33 laps
4 D. Coulthard Red Bull 1:31.654 44 laps
5 F. Alonso Renault 1:31.731 28 laps
6 N. Rosberg Williams 1:31.963 97 laps
7 T. Glock Toyota 1:32.407 33 laps
8 J. Trulli Toyota 1:32.571 47 laps
9 N. Hulkenberg Williams 1:33.102 13 laps
10 K. Nakajima Williams 0:00.000 1 lap
11 N. Piquet Jr. Renault 0:00.000 1 lap