Rome, March 15 - Ferrari duo Fernando Alonso and Felipe Massa notched the sixth- and eighth-fastest times respectively in Friday's practice sessions ahead of the season-opening Australian Grand Prix on Sunday. Red Bull's German driver Sebastian Vettel, who is bidding for his fourth consecutive world title this year, notched the fastest time on the Melbourne street circuit. "Overall, this was a very productive Friday, as we did a lot of laps and got through an important initial analysis of the behaviour of the two types of Pirelli tyres available for this race," said Spain's two-time world champion Alonso, who finished second to Vettel last season. "Our efforts were helped by particularly favourable weather with sunshine and summery temperatures. "However, the weather is expected to change completely from tomorrow, with wind, rain and a significant drop in temperature, which could influence Sunday's race. "I'm not expecting any major surprises here, we already knew we were not the quickest and that was confirmed today. "The car responds well, but we know there is still much to do if we want to fight with the very best".