The Kenyan broke the world mark at the Berlin Marathon last year.
There are eight men with sub-2:06 credentials, 12 women with sub-2:24 marks.
Lelisa Desisa of Ethiopia presented his medal to Secretary of State John Kerry.
American Jason Hartmann duplicates his fourth-place result from 2012.
Can Shalane Flanagan become the first U.S. female to win since 1985?
Brian Metzler experienced the sights, sounds and smells of the French Quarter by running through it during Happy Hour.
Former Los Angeles Marathon champion and 2:04 marathoner Markos Geneti of Ethiopia is also part of Sunday's star-studded field.
Past champions and multiple Olympic medalists are listed amongst the top entrants.