When he played for Oklahoma City, James Harden was a key part of a well-balanced team, helping the Thunder reach the NBA Finals. Now with the Houston Rockets, and facing that Oklahoma City franchise in Game 1 of the Western Conference playoffs, Harden essentially was a one-man show. And it got terrible ratings. Harden scored 20 points on 6-of-19 shooting, and he was the only real threat for the Rockets in the opening 120-91 loss on Sunday. The Rockets shot 35 percent from the floor, while the Thunder shot 53 percent. Kevin Durant (24), Russell Westbrook (19) and Serge Ibaka (17) provided balance for the Thunder in the rout. “It was awkward before the game,” Harden said of facing his former teammates, “but once the ball went in the air I just tried to go out there and win.”