The 22-year-old American signs a worldwide marketing and management representation agreement with the company.
It is no yet known if the 28-year-old former world No. 10 plans to return to the tour.
14-year-old Felix Auger-Aliassime gave tennis fans something to get excited about on a slow week for the ATP and WTA Tours.
In his return to Hamburg, the king of clay will face Fernando Verdasco in the first round.
Scott Lipsky's heroics were thwarted by the all-out hustle of Leander Paes on this fantastic WTT doubles point.
Former U.S. Open champion announces split in Facebook post.
Kei Nishikori grew up hitting against the wall, now he hits through the wall in a new TV commercial.
