Daniel Ricciardo remains firmly in the frame as a potential replacement for Mark Webber should his fellow Australian decide to walk away from Red Bull Racing – and, potentially, F1 – at the end of the 2013 season, but admits that he still needs to prove himself.The Toro Rosso driver faces rivals both from within the Red Bull development structure – such as team-mate Jean-Eric Vergne and WSbR star Antonio Felix da Costa – and elsewhere on the F1 grid, such as Lotus' Kimi Raikkonen, but insists that he can only do his best with the equipment at his disposal. That currently translates to just two finishes from four races in 2013, but the first of those was the sort of stand-out...
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