Damien Hooper of Australia won a 13-11 decision over American light-heavyweight Marcus Browne Monday, the first Olympic loss for the U.S. boxers. The United States had gone 4-0 over the first two days of the Olympic tournament and American flyweight Raushee Warren received a bye into the second round Monday. Browne, however, lost a close battle with Hooper, who will now take on Russian Egor Mekhonteev in the second round. Among the anticipated second-round bouts in the light-heavyweight division will the one between China\'s Meng Fanlong and Brazil\'s Yamaguchi Florentino. They will meet Sunday. Meng easily disposed of Ahmed Barki of Morocco 17-8 and Florentino was a 15-14 winner over Sumit Sangwan of India.