http://news.nationalpost.com/sports/rio-2016/steve...
With the increase in movement of peoples around the world this is going to increase.
As Simmons says, in professional sports you're basically cheering for laundry. It was always different in international sports, I remember Ken Read saying about the national ski team, you can't trade some downhill racers for Super-G, you're stuck with who you got. But, that's going to change quickly too.