Manny Pacquiao continues to defy Father Time as he enters another title bout against Yordenis Ugas

Pacquiao, 42, has seemed to find the fountain of youth while facing some of the best of the new generation

It was just over six years ago that defending welterweight champions Floyd Mayweather and Manny Pacquiao met in boxing's biggest fight to date for the title of best fighter of their collective era.   Although the superfight came roughly five years too late following an extended soap opera of delays, it was still a matchup of the two best fighters, pound for pound at the time, on the planet. And given their respective ages -- the unbeaten Mayweather was 38, Pacquiao was 36 -- there was a historic element at play to the fight offering each the final chance to permanently define their legacies with a win.   Pacquiao, who partially blamed an injured shoulder, would go on to lose the fight by convincing decision and Mayweather, as expected, would retire for good four months later from the "traditional" portion of his fight career (despite a trio of comebacks best described as quasi, if not full-on, exhibitions). Pacquiao, however, never stopped fighting.