By Andrew Downie RIO DE JANEIRO (Reuters) - Rampant Germany hammered Portugal 4-0 to reach the semi-finals of the men's Olympic football tournament on Saturday where they will be joined by Nigeria and Honduras. The Nigerians, champions in 1996, beat Denmark 2-0, while Honduras were outplayed but still overcame South Korea 1-0. Germany will face Nigeria in the semis, while Honduras will meet the winners of the match between hosts Brazil and Colombia, who play later on Saturday. More...