Ferrari driver Fernando Alonso acknowledges the team needs to improve sharply and quickly on the performance it showed in Sunday's F1 season opener when the scarlet cars were well off the pace of their rivals.
Mercedes driver Nico Rosberg comfortably won the Formula One season-opening Australian Grand Prix on Sunday, after pole sitter and teammate Lewis Hamilton plus world champion Sebastian Vettel suffered early retirements.
Jenson Button steered his repaired McLaren to the fastest lap on Wednesday, and Nico Rosberg helped Mercedes rebound from Lewis Hamilton's crash with the longest run on the second day of Formula One preseason testing.
Sebastian Vettel heads into the weekend with a chance to repeat his 2011 feat of clinching the Formula One title in Japan with four races to spare -- and join Michael Schumacher and Juan-Manuel Fangio as the only men to win four-straight championships.
Kimi Raikkonen and Fernando Alonso insist they will be able to cooperate as Ferrari teammates next season despite many predicting friction between two former world champions who are accustomed to being the No. 1 driver in their team.