If I had the choice and no one could veto it:
Jackie Joyner Kerse
Imagine if Lagat had gained US citizenship and just fizzled out. US-born runners would not be where they are. African-born runners would not be coming here in droves like now, elevating our team.
Even though he was not born here, Lagat has been the best ambassador for US running abroad of the last 40 years.