Red Bull/Getty Images Reigning world champion Sebastian Vettel has conceded that Red Bull is not the team to beat ahead of next weekend's Australian Grand Prix. Red Bull has endured a problematic pre-season testing programme with its RB10 as overheating problems and issues with the Renault power unit restricted its running. Vettel echoed comments made by team principal Christian Horner, who admits that Red Bull is not in a position to challenge Mercedes. "It’s great to be starting the season next week," said Vettel. "We didn’t do as much running as we would have liked in testing this year, so we have work to do in Melbourne, but it will be good to get to the first race....
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