"Hopefully, other people don't get it and we get it, but there are other good teams around and I wouldn't underestimate anyone, so I wouldn't be surprised if many of the other teams had it as well."

Hamilton told reporters that he expected other teams to raise their game with Force India, which uses the same Mercedes engines as McLaren, the possible surprise package.

"Just from looking at the times, it looks like (Toyota) are doing quite a good job," the autosport.com Website quoted him as saying. "Renault doesn't look bad, BMW doesn't look bad, so there are quite a lot of teams looking pretty impressive at the moment."

On Tuesday, Germany's Sebastian Vettel said that Red Bull had made "a great leap forward" but is still not among the favorites for the season.

"It's a very good impression so far," the formula1.com Website quoted the 21-year-old, who was fastest in testing at Spain's Jerez circuit on Sunday, as saying of the new Adrian Newey-designed RB5 car. "It is still not 100 percent, but the car so far is quite reliable, fresh out of the box since we started here in Jerez at the beginning of February. It seems to go better and better."

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