SEATTLE, July 6 : United States coach Mauricio Pochettino said his side failed to show their true level in a crushing 4-1 defeat by Belgium in the World Cup round of 16 on Monday, as he declined to blame off-field distractions for the hosts' exit.Roared on by a fervent home crowd in Seattle and buoyed by impressive wins in the group stage and round of 32, the U.S. had entered the match with belief they could upset a Belgium team many considered vulnerable.Instead, Pochettino's side produced their most hesitant display of the tournament and were punished by a clinical Belgian team."We didn't show our real quality as a team," Pochettino told a press conference. "We never connected with the game. Belgium were better than us, and that's it."It was a very bad day. It wasn't our day, collectivel