Williams-Goss helped the USA win a gold medal in the 2013 FIBA Under-19 World Cup in the Czech Republic, while averaging 7.9 points, 2.8 rebounds, 2.7 assists, and 0.8 steals, while shooting 49.1 percent from the field, 42.1 percent from beyond the 3-point line, and 90 percent from the free throw line.