The Wimbledon finalist and former World No. 5 joins the list of former tennis players who have signed the #PPA ⬇️.Jack Sock, John Isner, Sam Querrey, Donald Young, Kaitlyn Christian, Tina Pisnik, and Chao Yi Wang➡️ Additionally, the PPA has signed former collegiate tennis players such as Lingwei Kong, Kate Fahey, Jackie Urbinati, and Pierina Imparato.#News #international