The most intriguing American to keep on eye in this Bundesliga season may be Santiago Castaneda, a diamond in rough from Florida who went pro in Germany at age 18 in the third division. Last season he helped Paderborn win promotion to the 1. Bundesliga.

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Soccer America Executive Editor Mike Woitalla has written freelance articles about soccer for more than 30 media outlets in nine nations. The winner of eight United Soccer Coaches Writing Contest awards,...