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Each World Marathon Majors series originally spanned two full calendar years; the second year of a series overlapped with the first year of the next. 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. Series X started at the 2016 Boston Marathon and finished at the 2017 Boston Marathon. Series XI started at the 2017 London Marathon and finished at the 2018 London Marathon.
^ abLiliya Shobukhova (Russia) was the original winner in Series IV and V but she was disqualified from competition for a doping violation in April 2014 and all her results from 9 October 2009 have been annulled.[13]
^Rita Jeptoo (Kenya) won four races in the 2013–14 series but gave positive A and B samples in an out-of-competition test in September 2014.[15]
^Jemima Sumgong (Kenya), who won two races in 2016 but gave a positive sample in an out-of-competition test in February 2017.[16]