Dutch runner Sifan Hassan has long been revered for her versatility in mid- and long-distance running, but now she is set to go the extra mile — or rather, 26.2 miles — at the Paris Olympic Games.

Sifan Hassan plans to run the Sydney Marathon on Aug. 31. Her management team says that means she does not plan to compete at the World Track and Field Championships in Tokyo from Sept. 13-21. Hassan, ...