The New York City Marathon was cancelled in 2012, and consequently is not included for the 2011–12 or 2012–13 seasons.
In years where the World Athletics Championships or Olympic Games are contested, the marathon at the respective event is also included.
Starting in 2015, each series began with a defined city race and ended with the following race in the same city.
So, series IX started in February 2015 at the 2015 Tokyo Marathon and ended there in February 2016 at the 2016 Tokyo Marathon.
The leaderboards show all top placing finishers for the given season.