Nico Rosberg will only stand a chance of beating Lewis Hamilton in the fight for the 2015 Formula 1 World Championship if he improves his performances in qualifying, says Toto Wolff.

Having ended the 2014 season with the edge on Hamilton in qualifying having taken 11 pole positions compared with his Mercedes team-mate's tally of seven, Rosberg has been comprehensively out-performed on a Saturday in 2015.

Indeed, with Hamilton having accumulated 10 pole positions against just the one for Rosberg in 2015, Mercedes motorsport boss Wolff believes this deficit is ultimately making the difference

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"[Rosberg needs to] Get half the job done in qualifying on Saturday," he said. "That is crucial to get off the line in the lead. At the moment Lewis just seems on a roll.

"His pace yesterday was incredible, his middle sector yesterday was half a second clear of everybody else and with the momentum Lewis has... he just scores the big points."

Rosberg has previously explained his slip in Saturday form as intentionally compromising his single lap pace in an effort to give him a better set-up in race trim, but having won just three races compared with Hamilton's six, the pair are now split by 28 points with eight rounds of the 2015 season remaining.

Indeed, with Wolff noting that the pair are often split by mere fractions of a second, every advantage that Rosberg can get will be beneficial to him.

"They are often split by fractions, thousandths of a second and the gap is not big. If you're in the same car, with the same resources, it is difficult to gain an advantage and probably this is what he finds himself to do."