Bringing it back to someone who is in an overly privileged position. Getting four titles in any sport does not constitute a reason for a knighthood. If they use that position to promote their sport, their country and help others then a knighthood can be a nice, and to be truly deserving, unintended consequence of success in a sport.
Anyway, as the US hasn't been part of the commonwealth for a long time now I don't think Hamilton qualifies?
