Caroline Rotich pulled the big upset in Boston as the successful half marathoner outkicked even money favorite Mare Dibaba for the win after American Desi Davila led for much of the race.

2014 Chicago champ Mare Dibaba leads the field, though she'll be challenged by fellow sub-2:20 woman Buzunesh Deba, who would have set a course record last year if not for drug cheat Rita Jeptoo. World junior record holder Shure Demise Ware and former champs Caroline Kilel and Sharon Cherop will also be on the start line.

His top competition will be Vincent Kipruto (2:05:13). CR holder Meselech Melkamu (2:21:01) leads women's field as she faces Aberu Kebede (2:20:30) and Sharon Cherop (2:22:28).

Don't be uneducated when you watch Monday's Boston Marathon. We break down the international portion of the field. Rita Jeptoo headlines three returning champs in the field, we've also got an LRC fan, and a Dibaba. And if a blond haired woman crosses the line first and it's not Shalane, we've got you covered.