BETTING GUIDE: Who are the favourites for the season-opener in Bahrain?

The longest season in F1 history gets under way this weekend in Bahrain, as Red Bull set about trying to defend their titles. But the others might have a thing or two to say about that, especially given pre-season testing left a lot of unanswered questions. Can Mercedes, McLaren and Ferrari take the fight to the Bulls? Can anyone beat Max Verstappen or is the Dutchman going to pick up where he left off last year? Lets see what the odds tell us¦