Ex-world champion Floyd Mayweather Jr. has confirmed he will return to professional boxing later this year, extending a career that has already secured his place among the sport’s most decorated and lucrative figures. The 48-year-old, who retired with an unbeaten 50-0 record, has not fought professionally since his 10th-round technical knockout victory over former UFC champion Conor McGregor in August 2017. That win allowed Mayweather to surpass Rocky Marciano’s long-standing 49-0 mark and retire undefeated. Before stepping back into sanctioned competition, Mayweather is scheduled to face former heavyweight champion Mike Tyson in an exhibition bout this spring. Following that event, he says, will come his first professional contest in nine years. No opponent, date, or venue has yet bee...