The master league mode puts you on the long road to glory by playing matches in an effort to win money for purchasing better players. (snackbar-games.com)
Other than the campaign mode, there is an online leagues mode where you can race against your friends too. (playstationing.com)
For me personally, I am not sure that this mode appeals to me as I tend to stick more toward the offline season mode and online league mode. (mammothgamers.com)