Abdi Abdirahman drops out of 2013 Boston Marathon

And then there were none.

American Abdi Abdirahman announced he had to drop out of the 2013 Boston Marathon due to an illness, meaning that all three members of Team USA's Olympic marathon team have been forced out of running in Monday's race.

Ryan Hall pulled out of the race back in March because of a nagging quad injury, and then just a bit more than a week ago, Meb Keflezighi was forced to withdraw because of a calf injury that limited his training. Abdirahman cited the flu as his reason for dropping out.

Abdirahman was the third qualifier for America's marathon team in London, behind Meb and Hall, but was forced out with a knee injury early on in the race.

Just two of the six members of the U.S. Olympic marathon team, Shalane Flanagan and Kara Goucher, remain in the field for the Boston Marathon. The top U.S. elite male that remains is Jason Hartmann, who finished fourth overall in last year's Boston Marathon.