Description Available in: The USA Women's 3x3 Teams are two of the 3x3 basketball teams under the auspices of the USA Basketball organization. In 2007, FIBA decided to start championships for the 3x3 event (also called three-on-three), starting in 2010. Two events are held, one for athletes under 18 years of age and one open event. The under 18 event (U18) is held every year, although in every fourth year, starting with 2010, the event is part of the Youth Olympic Games. The open events are held every other year, in even-numbered years, starting in 2012.