Rosberg won't make assumptions after Hamilton penalty

By Abhishek Takle SPA-FRANCORCHAMPS, BELGIUM (Reuters) - Lewis Hamilton's grid penalty may be the break Nico Rosberg needs to re-ignite his Formula One title bid but the German is refusing to take victory in Sunday's Belgian Grand Prix for granted. "That is going to make the weekend less difficult for me, for sure, because he is my biggest direct rival," Rosberg told reporters at Spa on Thursday. "Nevertheless it's still going to be a challenge." Hamilton, who leads Mercedes team mate Rosberg by