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Red Bull team principal Christian Horner says that the team's RB10 needs pace and reliability ahead of next weekend's season-opening round in Australia.
The team has struggled during pre-season testing as reliability issues have put the reigning world champions on the back foot.
"After testing we quite clearly have a car which doesn't have the ultimate pace, and doesn't have the reliability," he told The Telegraph.
"So they are fairly two fundamental factors that we need to get on top of."
"Pre-season hasn't gone anywhere near as well as we would have liked or hoped, but it doesn't in any way defer our challenge, and make a dent in our drive...
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