Poll: does victory at Chinese Grand Prix make Nico Rosberg a genuine contender for Formula One world title? Jenson Button was the only driver that looked likely to deny Rosberg of his first victory, but an error-strewn third pit-stop put paid to the Briton's chances and gave the leading Mercedes driver an untroubled run to finish more than 20 seconds ahead of his rivals. With both Mercedes drivers posting some impressive times so far this season? Are they in fact the team to beat? So far this season much has been said and written about the team's innovative DRS system which has seen Mercedes race extremely competitively, particularly in qualifying when DRS usage is not limited. Teams have been awaiting clarity on the system with Lotus going as far as lodging a formal complaint which was last week rejected by the FIA. With the governing body approving the system as legal, will Rosberg and Mercedes now be included among the likely candidates to lift the championship this season? Cast your vote and have your say below.