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 back a little...
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