oddsportal.com (no I am not affiliated with this site, just another tool for gamblers)
this site makes it really easy to track your plays, just go to the game you want and click predict on the side/line you want (you have to create an account first) and it is added to your predictions
it does everything for you, track wins, losses, percentages, return on investment etc
also it is a great source for free picks, you can see which users have the best results and choose to follow their plays, kinda cool
edit* I am just realizing that sbr might not allow me to post this, if that is the case, I apologize and a mod can just delete this