Formula 1 world champions Mercedes remain in a league of their own after showing a 'worrying' step up with their latest power unit developments, according to Red Bull principal Christian Horner. Double world champion Lewis Hamilton won last weekend's Italian Grand Prix with a 25-second margin over Ferrari's runner-up Sebastian Vettel. In Friday's first practice, the Briton lapped more than a second and a half faster than Vettel — whose car was the quickest after the Mercedes pair of Hamilton and Nico Rosberg. 'It [the Mercedes engine] looked quite frightening on Friday and then obviously they must have had some sort of issue with Rosberg because it looked like they wound the engines...
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