While we're on the topic I had a major bone to pick with Steffi Graf. And to ask the wrong question..was Agassi the Mayweather or Paulie of his time? An underdog seems to denote a given of being tested prior, you're known. At 15 Gauff just sideswiped Venus and the sport and now opened more doors than the one she just crashed. Kirk Gibson hobbling to the plate..there's your underdog.