For the fourth Grand Prix in a row, Mercedes secured a one-two finish in Azerbaijan to hand Valtteri Bottas a slender one-point lead over teammate Lewis Hamilton in the drivers' championship.

The pair could not have wished for a better start to their 2019 campaign as Mercedes have taken maximum points from the season’s first four races.

But not everyone has been enjoying their undisputed dominance, with Ferrari's Sebastian Vettel frustrated at how the season has panned out so far.

The German clinched the last podium place in third but was significantly behind the ridiculously fast pace set by both Mercedes drivers.

Vettel - in the midst of a smile - said: “It is so boring," per Planet F1.

“It’s not just four races, it’s been what? Four years? More or less.”

Despite their dominance, Vettel refuses to stay beaten and believes his team can improve and challenge the reign of his rival team.

“We have got to work harder and better. We are pushing as hard as we can, but we need to also respect that they [Mercedes] are doing phenomenally well and getting their cars, most of the time, in the right place.

“But I’m still confident. I believe in this team and think we can improve.

“I think we have a good but don’t manage yet to put it where it belongs, so it’s difficult to have the trust and the feel [with the car].”

Mercedes boss Toto Wolff obviously denied the claim that his team’s heroics were making the sport “boring”. Instead, he is staying focused on maintaining his team's dominance.

“I don’t think it’s boring,” he insisted.

“I think you look at the Formula 2 race and there are lots of incidents and safety cars, but the Formula 1 drivers race a lot more cleanly. We are talking about the best drivers in the world.

“As a fan, I would like to see different winners and a big fight from start to finish, but I lead the Mercedes team — and I do everything so that it performs as well as possible.”

Vettel will have a chance to upset their clean sweep in Barcelona for the Spanish GP on May 12.