Renault progress could tip balance in Mercedes fight, says Horner

After encouraging progress in 2016, many are tipping Red Bull to be Mercedes' main challengers when all-new regulations are unleashed at the start of next season. But Horner is more cautious about the situation, and thinks much depends on the development Renault can make – with the French car manufacturer preparing an all-new power unit for the upcoming season. "They [Renault] are ... Keep reading