Joe Louis ' and Manny Pacquiao 's fight will be the richest ever . Sportsmail 's Jeff Powell is counting down the ring 's most significant fights . Floyd Mayweather Jr 1938 re-match with Max Schmeling is the second in the series .
Floyd Mayweather Jr and Manny Pacquiao 's fight will be the richest ever . Sportsmail 's Jeff Powell is counting down the ring 's most significant fights . Joe Louis ' 1938 re-match with Max Schmeling is the second in the series .