F1: Jenson Button worried by Sebastian Vettel's reign at the top

German driver has won last three titles

Red Bull driver Sebastian Vettel at pre-season testing (GETTY IMAGES)

Jenson Button believes another world title for Sebastian Vettel and Red Bull would be bad news for the sport but says that as long as the new season is as exciting as last year's the fans will be happy.

Vettel and his team go into the season, which starts in Adelaide this weekend, as favourites for a fourth championship in a row.

Asked if that would be bad for F1, the McLaren driver said: "If he walks away with it, it probably wouldn't be the best thing. But if it's a season like last year or 2010, I don't think it's such a problem because the racing has been great for the last few years, the best racing I've ever seen.

"But for us it would hurt a lot because the team hasn't won the world championship since 2008, and I haven't won it since 2009."