Pacquiao, Roach scheme on plan for Mayweather’s defense (The Associated Press)

Manny Pacquiao and trainer Freddie Roach have spent the past two months trying to solve the biggest puzzle in modern boxing. How does anybody hit Floyd Mayweather Jr., a fighter whose perfect career is built on being nearly impossible to touch? Pacquiao and Roach will reveal their answer in detail Saturday night in Las Vegas, when the fighters meet in the richest bout in boxing history. While Roach took a much-deserved break, Pacquiao shadowboxed across the canvas, peppering the air with hundreds of rapid-fire punches long after his workout could have been over.