Updated On: 20 May, 2015 07:52 AM IST | | PTI
<p>F1 boss believes German driver will give Mercedes teammate Hamilton a tough fight in the next race</p>

New Delhi: Nico Rosberg has thrown down the gauntlet to Lewis Hamilton by winning his first race of 2015 in Spain and the German will make life tougher for the reigning champion at this weekend's Monaco Grand Prix, feels F1 boss Bernie Ecclestone.
Bernie Ecclestone
Rosberg beat Hamilton for the first time this season at Barcelona, putting him 20 points adrift of the Briton (111 points) after five races.