In my opinion, if floyd would indeed fight toe to toe with oscar, I won't be surprised to see a mark in floyds face and much more than you'll ever expect. Ist off, eventhough oscar has become slower these days, he is still no baldomir, he is sharper, powerful, faster than baldo. 2ndly, floyd will be coming off at the highest weight of his career, we wouldn't exactly know the effect of it in his conditioning,power and speed, if his speed diminshed enough for oscar to see his crafty punches and movements, he will surely have great problems. Finally, Oscar has fought possibly all the toughest opponent that is available in his way up in every weight division he can possibly reach. So oscar is clearly much much used to very very big fights and his very vast experience will help him stabilize his composure during heated fight rounds. On the othehand, if mayweather can bring his natural speed in the ring and is really faster than oscar might realize and forget the "toe to toe idea" Oscar will be having a very long night chasing the chicken. Any idea of oscar being knocked down has a probability of 5% only. so you see that is next to impossible, unless he would be hit by another perfect liver shot.