Floyd Mayweather, Jr.
publication date: Sunday, September 3, 2017 (part of Fall 2017)
clue: This boxer, one of the best of all time, just retired with his undefeated record intact and his 50th win, against one of the top MMA fighters in the world.
explanation: Mayweather retired after fighting Conor McGregor in a heavily hyped match on August 26, 2017. more…
difficulty: very easy