i found that the easiest way to beat lebron was to make him 7'6 and lower his dunk, standing dunk, speed, vertical, and hustle stats. for some reason if you try making him 5'3, he can still finish with out any problems, but at 7'6 hes so akwardly huge that he cant finish over half of his dunk attempts. also by editing his speed and hustle he dosent chase down the ball and wont get off as many attempts as you will. i just used a low prop (bench, three tires, chair, etc.) and i just did the most generic dunks possible, like up+up, up+down, down+right, and so on. even though they are only worth 70-77 points the prop will up your score to the 78-82ish range. that dosent seem like much, but if you keep doing it youll easily get off nearly twice as many attempts as lebron. lebron will still try really difficult dunks, so when he does actually make one he will score between 83-88 points and he will also get around 30-35 for each missed attempt. after you play the dunk contest a couple of times and get your timing down, you really shouldnt have an issue beating lebron. just keep practing though, until you have your timing.