Ellie Greenwood

The Scottish-born Canadian won the world 100km road title in 2010, then went to the trails and won the Western States 100 in 2011 and 2012, the second in a course record that stood for years. In 2014 she added the Comrades Marathon, beating a deep field on South Africa's road classic. Road speed, trail endurance and a championship-style tactical race all suited her, which is exactly the range this list is about.