Rookie Carlos Sainz has admitted to some nervousness about Red Bull's F1 crisis. The energy drink company has threatened to pull both of its teams out of the sport because, as things stand, it cannot find a competitive alternative to its underpowered Renault engines. That is despite the fact that Red Bull Racing and Toro Rosso are actually committed contractually to F1 through 2020. 'Well, as Bernie Ecclestone would say, circumstances change,' team boss Christian Horner insists, 'and circumstances now are very different.' Red Bull's quit threat – although it has been heard before – is being taken more seriously this time, as the two teams are genuinely without engine deals...
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