Hamilton tips Rosberg to keep edge over Schumacher

Lewis Hamilton has tipped Nico Rosberg to retain his edge over Michael Schumacher at Mercedes.

Rosberg, a former karting teammate of 2008 world champion Hamilton and now a F1 rival, has signed on for the next few years with the German team, where in 2010 and 2011 he was the standout performer alongside the great Schumacher.