Sebastian Vettel says there is no reason to believe that Red Bull cannot beat the Mercedes' in 2014, even if he admits it is unlikely they will be overhauled on speed alone.

The four-time F1 world champion has endured a difficult season in 2014 so far and is yet to win a race as he struggles with a Renault-powered RB10 chassis that has proven considerably less competitive than the dominant Mercedes, while reliability has also been patchy.

Currently sixth in the standings with a best finish of third, Vettel nonetheless played down the suggestion he cannot challenge for race wins in 2014, pointing out that Mercedes' equally inconsistent reliability could open the door for him.

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"I think it is always possible to win races, that is why I am here," he said. "It would be sad if I turned up and didn't believe in myself or the chance to win. Obviously, if everything is normal being realistic it is difficult to beat the Mercedes because they are so much quicker than anyone else. There is the aqua park here so they could have nice Saturday afternoon and still win the race on Sunday!

"They are not invincible though. We have seen in Montreal and Silverstone that they had problems, so then you need to put yourself in position to be the first one to benefit. So there is always a chance."

With Red Bull currently second to Mercedes in the constructors' standings, helped in part by team-mate Daniel Ricciardo's win in Canada, Vettel is keeping an eye on the increasing threat from Williams, even if he thinks his team will be stronger around the slower Hungaroring this weekend.

"As a general trend, Williams has made a step since Austria. We know that they are competitive down the straights, but they have gotten a lot more competitive in the corners.

"I think it could favour us a little more this weekend though, the fact there is one straight and small straights in between. I wouldn't mind if it suits us here than previous races, but difficult to predict."