Canada's Milos Raonic, right, of Toronto, Ont., and Vasek Pospisil, of Vancouver, talk with their coaches while playing with a soccer ball after Davis Cup tennis practice in Vancouver, B.C., on March 4, 2015. Milos Raonic and Vasek Pospisil have met just a handful of times on the ATP Tour, but their rivalry runs deep. The two Canadians will face off Thursday in the second round of the U.S. Open for their first Grand Slam match, and just the fourth on the top-tier men's tour. THE CANADIAN PRESS/Darryl Dyck