Does RL own uspa and polo assn?

No, the U.S. Polo Assn. brand is not affiliated with RL at all.

U.S. Polo Assn. brand products are authentic and officially sanctioned by the United States Polo Association, the governing body for the sport of polo in the United States since 1890. They are the brand associated with the United States Polo Association (USPA).

Their sales actually afford the USPA the opportunity to increase polo player member benefits and promote the sport through training centers for interscholastic and intercollegiate polo competition, while better regulating the rules of the game through programs in umpiring, competition, and ensuring the safety and welfare of our equine companion players.