From Lidingö to Eldoret, follow the season across 23 currently listed meetings in 10 countries. Here are the dates, venues and tour levels, with the next meetings first and any unsettled details clearly marked.
Vincent Kipkorir Kigen needed every bit of his lead in Porto, while Ergat Kahsay Heshe won the women's race with authority. Portugal's own athletes and the 10K winners supplied further stories.
Porto's international marathon titles went to Kenya and Ethiopia, but Fernando Serrão, Miriam Martins and the 10K winners gave Portugal a proud day too.
Athens rewrote historic records; Málaga delivered a major women's marathon breakthrough; Itálica served up one of the closest cross-country finishes of the season.
A champion chasing a Boston first. A trio of Greek runners racing history. A Danish triathlete returning to the deep end. Across nine big races this weekend, the names on the start lists tell more than one story.
Porto's marathon offers another chance to discover what 42.195 kilometres can feel like when the pacing, weather and atmosphere come together. The city’s famous riverfront scenery is a bonus; it will not rescue anyone who mistakes the first 10 kilometres for a tempo run.