what was the most watched sporting event ever?
['2008 Beijing Summer Olympic Games – 4.7 Billion Viewers.', '2018 FIFA World Cup – 3.6 Billion Viewers. ... ', '2018 Tour de France – 3.5 Billion Viewers. ... ', '2015 Cricket World Cup – 2.2 Billion Viewers. ... ', '2015 Rugby World Cup – 1 Billion Viewers. ... ']