Can someone help me?

There's something weird happening with my Virtua Tennis. The controller Vibration setting is always resets itself to "off" when I stop playing the game. I have to go to the game options, and set it to "on" manually every time I boot the game.

Does this happens to you too? 

Yea..And i dunno hw to set it to perma vibration on..hahaz..

I still cant unlock Duke or King,they're so fake...

I just unlocked King.    I noticed that there's a pattern you can use to defeat King.

Here's how I defeated King:

1.  Serve using the slice (X) button, use as little power as possible.
2. If you're serving from the right side of the court, King will return the ball to the left side, so be prepared and go to the left side as fast as you can. (If you serve from left side, then be prepared to go to the right side.)
3. Once he returned the ball, hit a ground stroke as hard as you can using the "A" button. If you do it correctly, he will lose his balance while returning the ball to you and fall.
4. Use a volley shot to smash the ball and he wouldn't be able to catch it.
I guess this is because Xbox 360 is the only platform they developed on that has a controller with vibration function. 
I defeated King using Federer. Going to attempt Duke next. 

Just unlocked Duke too. 

I used King to defeat Duke. Here's how I defeated Duke:

1. Serve using the slice (X) button, use as little power as possible.
2. He will randomly return the ball to either right or left side of the court. If he's returning the ball to the same side that you currently are, you're in luck. Corner smash the ball as hard as you can and he won't be able to catch it. 

One thing I like about this game is you won't go down in rank when you skip or did not participate in tournaments. In Top Spin 2, you will go down in rank if you skip tournaments to train and buff up your character.