Matt Tegenkamp and Adriana Nelson have been added to the list of stellar athletes, including 2014 Champion Meb Keflezighi and top American Shalane Flanagan, competing in the 2015 Boston Marathon.

Tegenkamp, a two-time track Olympian (2008, 2012), made his marathon debut in Chicago in 2013, running 2:12:28 for 10th place.

Nelson was the 2013 U.S. half marathon champion. Her marathon PB of 2:28:52 came from London 2008 when she finished 10th.

It was also announced that Ethiopian Ejegayehu Dibaba (2:22:09 PB) has dropped out from the women’s field due to injury.

Both Tegenkamp and Nelson will be racing the United Airlines NYC Half Marathon this Sunday, March 15.