Usta. Pro circuit t-shirt sighned by 4 pros!

This is a pro circuit tennis shirt. It has been signed by4 professional tennis players at a professional tennis match. My aunt is a professional tennis referee for the us open and other big matches and had this signed for her son. The shirt has a vintage worn look with white marks on both sides from where it was worn in game. Don't know much about tennis but know they where pros who signed it.