Horner not expecting Vettel dominance

Vettel has won four of the first five races of the campaign and leads the world title chase by 41 points from McLaren's Lewis Hamilton.

There are already fears that Vettel's runaway success could lead to a dip in interest in the sport, but Horner thinks that unlikely to happen.

"My job is to try and not make it exciting," explained Horner, whose team took a 1-2 finish in last year's Monaco Grand Prix.

"I suspect we are not going to be in that position. All of the grands prix so far have been fantastically exciting races.

"Even though we have won four of them, it has been phenomenal racing and Seb has had to work for those victories.

"Every grand prix he has won he has had to pass somebody for the lead and last weekend he had to work very hard. He had to make some decisive moves against [Felipe] Massa, Jenson [Button] and [Nico] Rosberg, and he absolutely delivered that.

"I think the form will see-saw from circuit to circuit. In Montreal we think the Mercedes-powered teams will be very competitive, and I think it will see-saw from circuit to circuit.

"At each type of circuit that we have been to, we've been able to be competitive and we haven't seen a huge see-saw in performance.

"At some races we have been more competitive on a Saturday than a Sunday, but generally we've been there and been able to cover what others have thrown at us - whether it was Ferrari at Istanbul or McLaren in Barcelona last week."

And although the world title fight is looking increasingly like a straight head-to-head battle between Vettel and Lewis Hamilton, Horner says Ferrari or Mercedes GP cannot be discounted yet.

"I don't think you can write either of the two teams off," he said. "The points are quite deceptive and the gaps look large at the moment. But there is a long, long way to go in this championship.

"Ferrari, with its heritage and resources, and the drivers that it has, you would be a foolish person to write it off at the moment. Fernando [Alonso] came from a long, long way back last year to lead into the final race of the world championship, so we don't underestimate any of our rivals."