INGLEWOOD, California, June 12 : U.S. forward Folarin Balogun scored a brace in front of a rapturous American crowd as the World Cup co-hosts romped to a 4-1 victory over Paraguay on Friday in their Group D opener.   After seven minutes, a swift combination from Weston McKennie and Christian Pulisic split the opposition defence and ended in Paraguay midfielder Damian Bobadilla touching the ball into his own net.  Balogun doubled their lead in the 31st minute as the U.S. attackers seemed to be