By Martyn Herman RIO DE JANEIRO, Aug 4 (Reuters) - Chris Froome describes Saturday's Olympic men's road race as a lottery but the Briton will still fancy his chances of winning gold alongside the Copacabana despite a brutal course that plays into the hands of his rivals. Fresh from winning the Tour de France for the third time in four years, Briton Froome has arrived in Rio with his eyes on two golds, having settled for a time trial bronze in 2012. The course, a 237km slog featuring 5,000 metres of climbs along Rio's verdant coastline, has everything from cobbles, lung-burning climbs and tricky descents and a flat blast to the finish. More...