I figured out the easy way to find what races you haven't WON. Go to the RECOMMENDS maps. The bright green diamonds are the ones you haven't won yet. I showed three on my map but once I clicked on them and it showed  what cars to use you can select a car and then with that car go to the races and see if you have won that one race with that car. If you haven't won a race with any of the available cars for that race, then you have just found the race you need. I now have 100% on the single player game.

Well now I have won 60 races. I have found all races and cars but I still have one race to WIN. I was hoping there was an easy way to find out which race that was. I guess I just have to go car by car and win all the races. I know that some races are run multiple times by different cars. Oh well I guess that is just the game. Run them all to get 100%.

I am playing on the PS3. I have found all 61 races. I have only won 58 of those. How do I find the races I haven't won? Right now I am going car by car and golding all the races but I can't fine the ones I need to win still.