Assuming he's in good shape and motivated, Sanders uses his speed and southpaw stance and stops Max in 5 or 6.
Sanders had so much natural talent. He would outweigh Max and be slightly taller too. Sanders fought a gallant fight against Vitaly Klitschko. He showed a great chin and a world of guts and heart. However, I don't think big Max had weaknesses that a fighter of Sanders' caliber could exploit. I mean, Sanders was good but we're not talking Joe Louis or Marciano here. Sanders hits Baer with some good shots early. Max smiles sardonically in recognition that the blows caught his attention. Max punishes the big south african steadily and puts him away in the 8th round. Baer KO 8 Sanders good matchup Magoo! This would be a great fight to watch for fans!