Part of Sebastian Vettel's problem in 2014 is that he is 'worn out', Red Bull team boss Christian Horner has revealed.
Having utterly dominated the sport, culminating in his four consecutive drivers' titles between 2010 and last year, the 27-year-old German has struggled for form this season.
Some think that following Mark Webber's departure, his new Australian teammate Daniel Ricciardo is simply putting Vettel in the shade.
Ricciardo, having graduated from the junior team Toro Rosso, is 6-5 up Vettel in qualifying, and with a clear 9-2 lead in the grands prix after 11 races -- including two wins compared to Vettel's none.
Horner says not only Red Bull but the entire world of F1 has been...
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