American player Vania King is endorsing the KAIKU prepaid Visa debit card. She has been promoting it on her social media accounts, including Facebook.

Draw: At the 2012 U.S. Open, being contested this week in New York, King lost in the first round to doubles partner Yaroslava Shvedova. They are still in the doubles draw as the fifth seeds, and will play 11th seeds Julia Goerges and Kveta Peschke in the round of 16. | Women's Doubles Draw

UPDATE: The endorsement is just for the duration of the 2012 U.S. Open. King will wear a patch on her kit.

More info: KAIKU Visa Prepaid Debit