I beat this last night by staying in front all of the 10 laps. The technique that I used was to ensure the AI was hitting me square in the rear right before the entrance to the corners. To achieve this I would stay to the inside on the corners and continue to stay to the inside through half of the straights (do not let them draft the entire length of the straight.) This will allow for the AI to draft and give you a nice bump and keep your lead. It was noted in another thread that the AI will not draft you when you take a far inside line. Constantly check your rear view on the straights to watch for the car that is giving you a bump draft, they will catch up fast in your draft. Make sure he is lined up straight. This helps you avoid drafting the entire AI field, which is when they will knock you out of the race. I lead each lap by .1 to .2, which is a lot considering the difficulty of the AI when leading laps.