And neither of these studs are from the U.S.
You've got a 15 year old running 45.69 to break Kirani James' record...
http://loopjamaica.com/2015/03/08/taylor-breaks-kirani-james-400m-record-carifta-trials/
And then you've got the 17-year old Qatari, Abdalelah Haroun, with a 44.68:
Kirani and Merritt better get in gear!