Fernando Alonso admits predicting the outcome of the Rolex Australian Grand Prix is nearly impossible with the Spaniard claiming any one of ten drivers could take the chequered flag.
There have been very few changes to regulations for the 2013 season and with many teams enjoying spells at the top of the times in testing, Alonso believes the season-opener is a wide-open contest.
"It's difficult to know; no-one knows who can win this race at the moment," Alonso told reporters at Albert Park.
"We'll have to wait and see to answer some questions that winter testing doesn't answer. I think there are top teams with a little bit of advantage, maybe it's not the same as last year when we saw seven different winners from seven different races, it was a bit mixed on the grid.
"I think this year with the consistency in the rules I expect the five top teams to have a little advantage and to have many, many surprises in the first races. From these five teams I think it's very difficult to see really after winter testing who has this extra two or three tenths that can make you win. At the moment I think it's very close and very difficult to choose one favourite.
"I think Mercedes, McLaren, Ferrari, Lotus and Red Bull showed some potential in different days in testing and in different parts of races last year and I think it's difficult to choose."
Despite lacking pace last season, Alonso took the championship to the final race in Brazil, but he is far happier with the progress Ferrari have made over the winter.
"It was not difficult to start better than last year because it was difficult to start any worse," he went on.
"We were a little bit too far behind and the winter has been much better than last year with understanding the car and working with the car and getting the results that we more or less expect. That gives us much more confidence and optimism to start the season with."