Bulgarian-born Mike Alexandrov is competing for the always competive US men's swimming team. He's a veteran competing in his third straight Olympic games, but his last two were for Bulgaria. He became American in 2009 and now swims for the red, white and blue. He actually grew up in the US, having arrived at the age of nine. Mike got a biology degree at Northwestern University and has been doing graduate studies in prosthetics and orthotics. Best of luck, Mike!