United States Badminton Organization (USBO) Badminton Calendar is one of the most waited items by badminton players every year. In 2012, the USBO Badminton Calendar features sponsors from Yonex, Wilson, Li-Ning, Black Knight, and Ashaway with images of world top players such as Lin-Dan, Lee Chong Wei, Peter Gade, Mathias Boe, Carsten Mogensen, Holvy DePauw, Saina Nehwal, Ithanon Ratchanok and Christinna Pedersen. Limited quantity available.