Desisa will be going for his third Boston Marathon win; Rotich her second.
Ethiopians Lemi Berhanu and Aselefech Mergia each won $200,000 for their winning efforts.
Several former Boston winners are among the field of 36 elite runners.
American Molly Huddle earns a spot on the podium with her 1:09:22 performance.
The American recently won the U.S. 5K and 20K titles.
There are eight men with sub-2:06 credentials, 12 women with sub-2:24 marks.
Lelisa Desisa and Rita Jeptoo won the men's and women's titles at this year's race.
Kim Smith and Stephen Sambu capture B.A.A. Distance Medley crowns.
Lelisa Desisa of Ethiopia presented his medal to Secretary of State John Kerry.
Running will endure and we will, too, because of running.