I think to come out fast could be a good idea. Not an all out attack but a much faster pace than Mayweather is used to and for god's sake use angles. Watch the De La Hoya fight and Hatton fight. Either of these two through more than a few punches then back off,square up and look for something. Marquez has to the throw everything in combination. Land three or four to Mayweather's one sharp counter. Another tendency Marquez has is to sit back wait,wait then throw a sharp combination. He can NOT wait for Mayweather he must initiate the fight and throw combinations. This is the first half of the fight if all is well.Second half if he is in the lead and knows it. Switch it up. You know Mayweather will start to come forward to throw some crisp clean shots that do alot of damage. This stage Marquez has too keep his leg's moving and hope Mayweather tire's a little and start's to reach for something. This is were Marquez is dangerous. This is only if Mayweather starts to come forward then work the angles and box,box,box-counter,counter,counter..

Seems farfetched but it can be done.