Caroline Dubois scored a first-round knockdown and retained her WBC lightweight title against Jessica Camara despite the bout ending in a technical draw due to an accidental clash of heads Saturday. Dubois, whose older brother Daniel is the IBF heavyweight champion, dominated in her first title defense, which ended just after the bell rang to start the third round. Camara’s right eye was swollen from punches and the Canadian was bleeding from a cut above her left eye — the result of an accidental clash of heads in the second round.