Daniel Nguyen is a graduate of Santa Barbara High School and University of Southern California, ( University of Southern California). In the 2009 United States Open, he and former teammate J.T. Sundling were defeated 3–6, 6–2, 6–1 in the first-round of the men’s doubles tournament by Máximo González and Juan Mónaco. They qualified after winning the Boy"s Junior National Tennis Championship Doubles Title in 2009.
He has won a total of 7 singles and 5 doubles Futures titles as of December 2015. Nguyen was part of the University of Southern California team that won the National Collegiate Athletic Association Team Championship title four consecutive years. Other accomplishments include winning the Boys 16s & 18s Doubles National Championships in Kalamazoo, being named the National Collegiate Athletic Association Tournament Most Outstanding Player in his sophomore year, and clinching the 2009-2010 and 2010-2011 National Collegiate Athletic Association Championships for University of Southern California.
