Hamilton wary of 'potholes' ahead

By Ian Gordon MONTREAL (Reuters) - Lewis Hamilton will start Sunday's Canadian Grand Prix as favourite for another win but Formula One's triple world champion remains wary of potential potholes ahead. The Mercedes driver has won four times at the Circuit Gilles Villeneuve, including from pole last year, while team-mate and championship leader Nico Rosberg has never tasted victory in Montreal. Hamilton's first win of the campaign in Monaco two weeks ago ended a barren run marked by bad luck and c