Before starting a Be A Pro season, edit the rosters to put all the best players on the same team. Now, when starting Be A Pro, select that team to join and the cup will be easy to win. You can play all the games out if you want. But if you just want to get it done quick, simulate a handful of game, then start the next game and score 1 goal and quit out. Now simulate another handful of games, score another point and quit out. Rinse and repeat. This will keep you from being demoted to the 2nd line.