LOS ANGELES—Patrick Cantlay and Xander Schauffele first competed at cards on the long flight to Australia for the Presidents Cup. They became partners in team events, roommates on the road, close friends who take vacations together with their wives, and more practice rounds than they can count.
Sunday at Riviera will have some familiarity to it with one exception: They have never competed against each other with $4 million on the line.
