We've all been there—you're in the middle of your best game ever, and you need to take a call, or leave for an appointment, or your kid/wife/mother-in-law (you name it) is calling you from the other room. Worst, you hit Menu / End Round/Main Menu thinking you could resume later, only to discover that you've lost the game.
Remember that whether you're playing a tournament or ranked round, choose Save & Quit if you need to continue the game later. In a multiplayer round, if you need to drop off be sure to finish it later...you'll keep a lot more friends that way.
Cheers,
WGT