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MEXICO CITY, MEXICO - OCTOBER 28:  Red Bull Racing Team Principal Christian Horner looks on from the pit wall during qualifying for the Formula One Grand Prix of Mexico at Autodromo Hermanos Rodriguez on October 28, 2017 in Mexico City, Mexico.  (Photo by Mark Thompson/Getty Images)
MEXICO CITY, MEXICO - OCTOBER 28:  Red Bull Racing Team Principal Christian Horner looks on from the pit wall during qualifying for the Formula One Grand Prix of Mexico at Autodromo Hermanos Rodriguez on October 28, 2017 in Mexico City, Mexico.  (Photo by Mark Thompson/Getty Images)

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Christian Horner: Mercedes favorites for 2018

Red Bull Racing boss Christian Horner says his team aren't in a position to realistically challenge for the Formula One title in 2018.

Christian Horner: Mercedes favorites for 2018

Red Bull Racing boss Christian Horner says his team aren't in a position to realistically challenge for the Formula One title in 2018.