"I don't know if I want to break my own record. I think I would rather leave it as it is"

Mark McGwire's quote recommends that he is uncertain about whether he wants to break his own record. It appears that he is content with the record he has currently attained and is not sure if he wishes to push himself to break it. This could be since he is satisfied with his current accomplishment and does not wish to risk not having the ability to break his own record. It could likewise be since he knows the pressure that comes with attempting to break a record and does not wish to put himself in that circumstance. Whatever the reason, it is clear that Mark McGwire is not exactly sure if he wants to break his own record and is content with leaving it as it is.