It's the matchup distance fans have been waiting for--Galen Rupp and Mo Farah will race on Sunday in the Chicago Marathon. Farah has only lost once to his former training partner (at an indoor mile race in 2012), but this is the first time the two will meet in a marathon.  

The 2018 Chicago Marathon is streaming live on FloTrack for viewers in the U.K. and Ireland.

Rupp is the more experienced of the two at the distance--Sunday will be the seventh marathon Rupp has started. Farah has only run two, both in London. 

Both men are primed to run fast. Rupp set a personal best this spring, a 2:06:07 in Prague, while Farah set his PR of 2:06:21 in London. With the presence of pacesetters (and big-name runners like Geoffrey Kirui, Abel Kirui and three men who have broken 2:05), the pace shouldn't lag. Will it go quick enough for Rupp to break the American record of 2:05:38? That's just one of a multitude of questions that will be sorted out on Sunday. 

Confidence Picks presented by Rocket Mortgage by Quicken Loans

• Galen Rupp defeats Mo Farah for only the second time in his career, as the two finish 1-2 in the men's race. 

• Rupp lowers his personal best of 2:06:07, but doesn’t quite break the American record of 2:05:38.

• Geoffrey Kirui places third behind Rupp and Farah--his fourth top-three finish in a row. 

• Brigid Kosgei wins the women’s race and breaks 2:20 for the first time in her career. Laura Thweatt finishes as the top American. 

• Triathlete-turned-marathoner Gwen Jorgensen breaks 2:30 in her first attempt at the distance since becoming a full-time runner.  

U.K. and Ireland viewers can watch the 2018 Chicago Marathon live on FloTrack