If your books are offering money lines for either of these games, take them. Mine offered these and I jumped all over them. I know people get sketched out by high risk bets like these, but trust me, these are in the bag. There is no way Spain loses to Croatia, and there is absolutely no way Argentina loses to Nigeria. Don't let the fear of a bad loss prevent you from winning easy cash.
Croatia is a team that lost to Italy in Olympic qualifying and almost lost to Greece. Italy and Greece don't give a shit about basketball. Their next opponent, Spain, has a trio of talented NBA players in Ricky Rubio, Pau Gasol and Nicolas Mirotic. Aside from the US, they are the best team in the tournament. I expect them to come out firing on all cylinders in their 2016 Olympic debut.
Argentina has one of the most experienced teams in the tournament. They are led by veterans Manu Ginobili and Luis Scola, who were part of the team who shocked the world and brought home gold to Argentina in 2004.
Nigeria, on the other hand, is lucky to have even qualified for the tournament. They have one decent player in Syracuse standout Michael Gbinije, but he's not nearly enough for the Nigerians to pose any real threat. Expect the Argentinians to cruise easily.