No, the world’s top sporting event is the Olympic Games.
The FIFA World Cup is the quadrennial soccer championship held every four years since 1930 (with two exceptions as a result of that whole WWII thing). The Cup’s final game is the single most viewed sporting event on earth. The 2010 match between Spain and The Netherlands was watched by an estimated 700 million people. That’s a decent chunk of the world’s entire population.
Super Bowl XLVI, in 2012, was the most watched “big game” in the history of the NFL. The match, which pitted the NY Giants against the New England Patriots, drew around 111.5 million viewers. When you consider how (relatively) few people outside of North America care about American football, that’s a proportionally huge number of folks tuning in to watch the Pats lose.