Brian Norman Jr.’s transpacific trip couldn’t have gone better. The hard-hitting WBO welterweight champion bombarded Jin Sasaki with various power punches, dropped the Japanese contender twice in the first round and brutally knocked out the game challenger early in the fifth round Thursday night in Tokyo. A sweeping left hook by Norman knocked Sasaki unconscious and abruptly ended a scheduled 12-round main event ESPN+ streamed from Ota City General Gymnasium in Tokyo.