The former World No. 1 will be running the 26.2 miles for charity.
Tommy Haas's withdrawal from the U.S. Open opens a spot for fan favorite Marcos Baghdatis in the main draw.
The Frenchman joins the ranks at the sports giant.
Lisicki hit a 131 MPH serve in her loss to Ana Ivanovic in Stanford.
The newest YTEX string on the market is also one of RSI's highest rated strings for players.
The patron of the charity, which works with young athletes in the UK, is the Duchess of Cambridge.
Andy Murray and Amelie Mauresmo are taking their relationship to the next level.