Red Bull/Getty Images Reigning world champion Sebastian Vettel is wary that Mercedes's strong straight line speed will be a crucial factor at this weekend's Canadian Grand Prix. The German won the Canadian Grand Prix in 2013 but fears that Red Bull could be in for a difficult time this weekend. "This year we are a bit down on power still so it will be difficult to match the Mercedes powered cars down the straights," he said. "But there are also some corners here and they’ve been good for us – we were in a good position in 2011 to win the race and we won here last year. I think we have reason to be confident but we know that [it won’t be easy]." "Obviously we...
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